1. Linear Equation in One Variable 1
Linear Equation
in One Variable
NG YIT HOE
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018-9095766
2. Linear Equation in One Variable 2
What is Linear Equation
• What is Linear Equation
• What is Variable
3. Linear Equation in One Variable 3
Linear Equation in One Variable
• A linear equation is an equation for a straight
line
• In form of where a and b are real
number and x is variable
bax +
23 +x
6. Linear Equation in One Variable 6
Linear Equation in One Variable
cont...
• There is only one unknown value, usually using
,
• For examples ,
x
03 =− y31=−x
9)1(3 =−x
34
3
)1(
+=
−
x
x
63 += zz
127 −= oo
7. Linear Equation in One Variable 7
compare these two equatuons
• Try to compare these two equatuons
514 =+51=+x
with value
with unknown
8. Linear Equation in One Variable 8
51=+x
• Left - hand side = Right -hand side
9. Linear Equation in One Variable 9
• What will if put x+1, 5 to the balance
scale?
Balance scale
1+x 511−+x 15 −
What will if adding -1 to the both sides
balance scale?
x 4
Result?
10. Linear Equation in One Variable 10
Addition and Subtraction
1511 −=−+x
15 −=x
4=x
51=+x Balance
• Left - hand side = Right - hand side
by adding 1 to both sides
11. Linear Equation in One Variable 11
Addition and Subtraction ...
• Left - hand side = Right -hand side
15 −=x
4=x
51=+x (ignore 1 step)
check the symbol.
when shifting cause
+ become -
12. Linear Equation in One Variable 12
Try these
4334 +=− xx
4213 −=− xx
xxxx 315659 −−=−−
13. Linear Equation in One Variable 13
Multiplication and Division
• Example 1
14. Linear Equation in One Variable 14
balance scale
• How to put to the balance
scale?
x3 6
3
3x
3
6
x 2
15. Linear Equation in One Variable 15
Multiplication and Division
• Example 1
16. Linear Equation in One Variable 16
Try These
x53 =
93 =x
9
5
3
=
x
2
5
3
=
x
