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A pair of linear equations in two variables is said to
form a system of linear equations.
For Example, 2x-3y+4=0
x+7y+1=0
Form a system of two linear equations in variables x
and y.
The general form of linear equations in two variables
x and y is
ax+by+c=0, where a=/=0, b=/=0
and a,b,c are real numbers.
Pair of lines
Comparison
of ratios
Graphical
Represen-
tation
Algebraic
Interpre-
tation
a1
a2
b1
b2 c2
c1
x-2y=0 1 -2 0 =/= Intersect- Unique
3x+4y-20=0 3 4 -20 lines solution
x+2y-4=0 1 2 -4 = =/= Parallel No solution
2x+4y-12=0 2 4 -12 lines
2x+3y-9=0 2 3 -9 = = Coincident Infinitely
4x+6y-18=0 4 6 -18 lines many
solutions
a1
a2
b1
b2
a1 b1
b1
c1
a1 c1
c2a2
a2 b2
b2
c2
From the table, we can observe that if the lines
represented by the equation -
a1x + b1y + c1 = 0
a2x + b2y + c2 = 0
are Intersecting lines, then =
b1
a2 b2
a1
are Parallel lines, then = =/=
Coincident Lines, then = =
b1 c1
a1 c1b1
b2
c2b2
b2
a2
c2
a1
Lines of any given equation may be of three types -
Intersecting Lines
Parallel Lines
Coincident Lines
Let us consider the following system of linear
equations in two variable
2x-y=-1 and 3x+2y=9
Here we assign any value to one of the two
variables and then determine the value of the
other variable from the given equation.
For the equation
2x-y=-1 ………(1)
2x+1=y
y =2x+1
3x+2y=9 ………(2)
2y=9-3x
9-3x
y= -------
2
x 0 2
y 1 5
x 3 -1
y 0 6
XX’
Y
Y’
(2,5)
(-1,6)
(3,0)(0,1)
Unique
solution
X= 1 ,Y=3
Let us consider the following system of linear
equations in two variable
x+2y=4 and 2x+4y=12
Here we assign any value to one of the two
variables and then determine the value of the
other variable from the given equation.
For the equation
x+2y=4 ………(1)
2y=4-x
y = 4-x
2
2x+4y=12 ………(2)
2x=12-4y
x = 12-4y
2
x 0 4
y 2 0
x 0 6
y 3 0
XX’
Y
Y’
(0,2)
(4,0)
(6,0)
(0,3)
No solution
Let us consider the following system of linear
equations in two variable
2x+3y=9 and 4x+6y=18
Here we assign any value to one of the two
variables and then determine the value of the
other variable from the given equation.
For the equation
2x+3y=9 ………(1)
3y=9-2x
y = 9-2x
3
4x+6y=18 ………(2)
6y=18-4x
y = 18-4x
6
x 0 4.5
y 3 0
x 0 3
y 3 1
XX’
Y
Y’
(0,3)
(4.5,0)
Infinitely
many
solutions
(3,1)
A pair of linear equation in two variables, which
has a unique solution, is called a consistent pair of
linear equation.
A pair of linear equation in two variables, which
has no solution, is called a inconsistent pair of
linear equation.
A pair of linear equation in two variables, which
has infinitely many solutions, is called a consistent
or dependent pair of linear equation.
There are three algebraic methods for solving a
pair of equations :-
Substitution method
Elimination method
Cross-multiplication method
Let the equations be :-
a1x + b1y + c1 = 0 ………. (1)
a2x + b2y + c2 = 0 ……….. (2)
Choose either of the two equations say (1) and find
the value of one variable, say y in terms of x.
Now, substitute the value of y obtained in the
previous step in equation (2) to get an equation in
x.
Solve the equations obtained in the previous step to
get the value of x. Then, substitute the value of x
and get the value of y.
Let us take an example :-
x+2y=-1 ………(1)
2x-3y=12………(2)
By eq. (1)
x+2y=-1
x= -2y-1……(3)
Substituting the value of x in eq.(2), we get
2x-3y=12
2(-2y-1)-3y=12
-4y-2-3y=12
-7y=14
Y=-2
Putting the value of y in eq.(3), we get
x=-2y-1
x=-2(-2)-1
x=4-1
x=3
Hence, the solution of the equation is (3,-2).
In this method, we eliminate one of the two
variables to obtain an equation in one variable which
can be easily solved. Putting the value of this
variable in any of the given equations, the value of
the other variable can be obtained.
Let us take an example :-
3x+2y=11……….(1)
2x+3y=4………(2)
Multiply 3 in eq.(1) and 2 in eq.(2) and by subtracting
eq.(4) from (3), we get
9x+6y=33…………(3)
4x+6y=08………(4)
5x=25
⇒x=5
Putting the value of x in eq.(2), we get
2x+3y=4
2(5)+3y=4
10+3y=4
3y=4-10
3y=-6
y= -2
Hence, the solution of the equation is (5,-2)
Let the equations be :-
a1x + b1y + c1 = 0
a2x + b2y + c2 = 0
Then, x = y = 1
b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
Or :-
a1x + b1y = c1
a2x + b2y = c2
Then, x = y = -1
b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
In this method, we have put the values of
a1,a2,b1,b2,c1 and c2 and by solving it, we will get
the value of x and y.
Let us take an example :-
2x+3y=46
3x+5y=74
i.e. 2x+3y-46=0 ………(1)
3x+5y-74=0………(2)
Then, x = y = 1
x = y = 1
(3)(-74)–(5)(-46) (-46)(3)-(-74)(2) (2)(5)-(3)(3)
x = y = 1
(-222+230) (-138+148) (10-9)
b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
so, x = y = 1
8 10 1
x = 1 and y = 1
8 1 10 1
x=8 and y=10
So, Solution of the equation is (8,10)
Pair of linear equation in two variables
Pair of linear equation in two variables

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Pair of linear equation in two variables

  • 1.
  • 2.
  • 3. A pair of linear equations in two variables is said to form a system of linear equations. For Example, 2x-3y+4=0 x+7y+1=0 Form a system of two linear equations in variables x and y.
  • 4. The general form of linear equations in two variables x and y is ax+by+c=0, where a=/=0, b=/=0 and a,b,c are real numbers.
  • 5. Pair of lines Comparison of ratios Graphical Represen- tation Algebraic Interpre- tation a1 a2 b1 b2 c2 c1 x-2y=0 1 -2 0 =/= Intersect- Unique 3x+4y-20=0 3 4 -20 lines solution x+2y-4=0 1 2 -4 = =/= Parallel No solution 2x+4y-12=0 2 4 -12 lines 2x+3y-9=0 2 3 -9 = = Coincident Infinitely 4x+6y-18=0 4 6 -18 lines many solutions a1 a2 b1 b2 a1 b1 b1 c1 a1 c1 c2a2 a2 b2 b2 c2
  • 6. From the table, we can observe that if the lines represented by the equation - a1x + b1y + c1 = 0 a2x + b2y + c2 = 0 are Intersecting lines, then = b1 a2 b2 a1
  • 7. are Parallel lines, then = =/= Coincident Lines, then = = b1 c1 a1 c1b1 b2 c2b2 b2 a2 c2 a1
  • 8.
  • 9. Lines of any given equation may be of three types - Intersecting Lines Parallel Lines Coincident Lines
  • 10.
  • 11. Let us consider the following system of linear equations in two variable 2x-y=-1 and 3x+2y=9 Here we assign any value to one of the two variables and then determine the value of the other variable from the given equation.
  • 12. For the equation 2x-y=-1 ………(1) 2x+1=y y =2x+1 3x+2y=9 ………(2) 2y=9-3x 9-3x y= ------- 2 x 0 2 y 1 5 x 3 -1 y 0 6
  • 14.
  • 15. Let us consider the following system of linear equations in two variable x+2y=4 and 2x+4y=12 Here we assign any value to one of the two variables and then determine the value of the other variable from the given equation.
  • 16. For the equation x+2y=4 ………(1) 2y=4-x y = 4-x 2 2x+4y=12 ………(2) 2x=12-4y x = 12-4y 2 x 0 4 y 2 0 x 0 6 y 3 0
  • 18.
  • 19. Let us consider the following system of linear equations in two variable 2x+3y=9 and 4x+6y=18 Here we assign any value to one of the two variables and then determine the value of the other variable from the given equation.
  • 20. For the equation 2x+3y=9 ………(1) 3y=9-2x y = 9-2x 3 4x+6y=18 ………(2) 6y=18-4x y = 18-4x 6 x 0 4.5 y 3 0 x 0 3 y 3 1
  • 22. A pair of linear equation in two variables, which has a unique solution, is called a consistent pair of linear equation. A pair of linear equation in two variables, which has no solution, is called a inconsistent pair of linear equation. A pair of linear equation in two variables, which has infinitely many solutions, is called a consistent or dependent pair of linear equation.
  • 23.
  • 24. There are three algebraic methods for solving a pair of equations :- Substitution method Elimination method Cross-multiplication method
  • 25.
  • 26. Let the equations be :- a1x + b1y + c1 = 0 ………. (1) a2x + b2y + c2 = 0 ……….. (2) Choose either of the two equations say (1) and find the value of one variable, say y in terms of x. Now, substitute the value of y obtained in the previous step in equation (2) to get an equation in x.
  • 27. Solve the equations obtained in the previous step to get the value of x. Then, substitute the value of x and get the value of y. Let us take an example :- x+2y=-1 ………(1) 2x-3y=12………(2) By eq. (1) x+2y=-1 x= -2y-1……(3)
  • 28. Substituting the value of x in eq.(2), we get 2x-3y=12 2(-2y-1)-3y=12 -4y-2-3y=12 -7y=14 Y=-2 Putting the value of y in eq.(3), we get x=-2y-1 x=-2(-2)-1 x=4-1 x=3 Hence, the solution of the equation is (3,-2).
  • 29.
  • 30. In this method, we eliminate one of the two variables to obtain an equation in one variable which can be easily solved. Putting the value of this variable in any of the given equations, the value of the other variable can be obtained. Let us take an example :- 3x+2y=11……….(1) 2x+3y=4………(2)
  • 31. Multiply 3 in eq.(1) and 2 in eq.(2) and by subtracting eq.(4) from (3), we get 9x+6y=33…………(3) 4x+6y=08………(4) 5x=25 ⇒x=5 Putting the value of x in eq.(2), we get
  • 32. 2x+3y=4 2(5)+3y=4 10+3y=4 3y=4-10 3y=-6 y= -2 Hence, the solution of the equation is (5,-2)
  • 33.
  • 34. Let the equations be :- a1x + b1y + c1 = 0 a2x + b2y + c2 = 0 Then, x = y = 1 b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
  • 35. Or :- a1x + b1y = c1 a2x + b2y = c2 Then, x = y = -1 b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
  • 36. In this method, we have put the values of a1,a2,b1,b2,c1 and c2 and by solving it, we will get the value of x and y. Let us take an example :- 2x+3y=46 3x+5y=74 i.e. 2x+3y-46=0 ………(1) 3x+5y-74=0………(2)
  • 37. Then, x = y = 1 x = y = 1 (3)(-74)–(5)(-46) (-46)(3)-(-74)(2) (2)(5)-(3)(3) x = y = 1 (-222+230) (-138+148) (10-9) b1 c2 - b2 c1 c1a2 - c2 a1 a1b2 - a2b1
  • 38. so, x = y = 1 8 10 1 x = 1 and y = 1 8 1 10 1 x=8 and y=10 So, Solution of the equation is (8,10)