Question

Which of the following equation is a linear equation of the first degree?

• A. $x^2=4$
• B. $7x^3=50+6$
• C. $9x+89+76=174$
• D. $1+2+3=3\times 2$

Answer 1

The correct option is C $9x+89+76=174$

Linear equations are also called first degree equation if the exponents of the variable is always 1.

Variable is $x$
Option A: $x^2=4$
Exponents of the variable = 2
Hence, this equation is not of first degree.

Option B: $7x^3=50+6$
Exponents of the variable = 3
Hence, this equation is not of first degree.

Option C: $9x+89+76=174$
Exponents of the variable = 1
Hence, this equation is of first degree.

Option D: $1+2+3=3\times 2$
As there is no variable in this equation, Hence it is not a linear equation.