Question

Line CD contains points A (4, −7) and B (4, 8). The slope of line CD is
A. zero
B. undefined
C. positive
D. negative

Answer 1

@ganeshie8

Answer 2

Use the slope formula.

\(\sf m = \dfrac{y_2-y_1}{x_2-x_1}\)

Answer 3

(4, -7), (4, 8)
x1 y1 x2 y2

Answer 4

Can you plug those numbers in?

Answer 5

i did the math isnt it undefined

Answer 6

@iGreen

Answer 7

Yep!

We end up with 0 at the bottom, and we can't divide by 0 so undefined is correct.

Answer 8

thanks @iGreen