Equations in One Variable: Definition, Examples & Solved Problems
1. FIRSTDEGREEEQUATIONIN ONEVARIABLE
DEFINITION:
The Equations in which the highest exponent is 1 are called the First Degree Equations.
All linear equations are first degree equations.
Equation of a straight line is a first degree equation.
EXAMPLES OF FIRST DEGREE EQUATIONS
Considerthe equation3x + 5 = 6.
The highestexponentof the variablesinthisequationis1.
So,3x + 5 = 6 is a firstdegree equation.
SOLVED EXAMPLE ON FIRST DEGREE EQUATIONS
Ques: Identify the first degree equation from the following.
Choices:
A. 8x � y = 3
B. 5x + 4x2 = 7x
C. 7x3 � 8x2 + 9x + 3 = 0
D. x2 + 2x + 1 = 0
Correct Answer: A
SOLUTION:
Step 1: The equations in which the highest exponent is 1 are called the first degree
equations.
Step 2: Here, only 8x � y = 3 has 1 as its highest exponent.
Step 3: So, 8x � y = 3 represent a first degree equation.