Question

Linear equation in one variable is :

• A. $2x=y$
• B. $y^2=3y+5$
• C. $4x-y=5$
• D. $3t+5=9t-7$

Answer 1

The correct option is D $3t+5=9t-7$

A linear equation with one variable is an equation with only one variable and the highest power of the variable is $1$.

In first option, there are $2$ variables, $x$ and $y$.

In the second option, there is only a $1$ variable but the highest power is $2$ hence, it is a quadratic equation.

In the third option, there are $2$ variables, $x$ and $y$.

In the fourth option, there is only $1$ variable and the highest power is $1$ as well.

Hence, option $D$ is correct,