Question

Select the linear equations in one variable.

• A. $3x+5=20$
• B. $x^2+5x+3=0$
• C. $5m-7n=5$
• D. $\frac{x}{3}+5x=3x+5$

Answer 1

Answer: (A), (D)

$\frac{x}{3}+5x=3x+5$

The equations $3x+5=20$ and $\frac{x}{3}+5x=3x+5$ are linear equations in one variable as they contain only one variable and their degree is 1.

The equation $x^2+5x+3=0$ has only one variable, but it is not a linear equation as its degree is 2.

And, the equation $5m-7n=5$ is a linear equation, but it has two variables 'm' and 'n'.