Write an equation for the following transformation of y =x; a vertical compression by a factor of 1/4 a. y=-4x b. y= -1/4x c. y = 4x d. y = 1/4x

Hello!

To write the equation of the function y = x with a vertical compression by a factor of 1/4, we need to use the formula: y = a · x.

In this equation, y = a · x, a is the vertical compression/stretch. Since a = 1/4, we can substitute 1/4 for a.

Therefore, the answer is D, y = 1/4x.