Question

What is the value of the function y=2x−3 when x=−1 ? −5 ​ −1 ​ 2 3

Answer 1

Try substituting/plugging in your x-value into the x variable in the equation to find out what y is. Usually, you'd solve for y when given x.
$y=2(-1)-3$
You just have to multiply your x-value by 2, and subtract 3 to result your y-value.

Answer 2

Need to find the value of the function.

As given x= -1

So, substitute the value of x in y:  

Y=2x-3

Y=2(-1)-3

Y=-2-3

Y=-5

So your answer is A. -5