Which equation represents a line with an undefined slope? y = x y = –x y = 0 x = 0

D.

Step-by-step explanation:

We are asked to choose the equation which has an undefined slope.

We know that slope of line will be undefined when the difference between its x-coordinates is 0 as slope is rise over run.

We also know that a vertical line is in form , where, x is any real number.

We also know that slope of a vertical line is undefined as horizontal displacement (run) of a vertical line is 0.

Therefore, the line has an undefined slope.

n

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.