Explanation
Step - 1 : State the definition of linear equation with one variable.
As per the definition , Linear equation with one variable is that equation which have,
literally one variable with highest power of 1.
Step - 2 : Choose the correct option using the definition.
The first equation is 2x = y.Where x and y are variables. So there are two variable.
⇒This is not a linear equation in one variable.
The second option is, y2 = 3y + 5. Here there is only one variable.But the highest power is 2.
In third option 4x−y = 5. Here there are two variables , x and y.
In fourth option 3t + 5 = 9t−7. Here there is only one variable and the highest power is also 1.
⇒This is a linear equation in one variable.
Thus, the linear equation with one variable is option (D) 3t + 5 = 9t−7.
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