Question

Which line has an undefined slope and goes through (5,-8)? A. Y=5 B. Y=-8 C. X=5 D. X=-8

Answer 1

Learn this...it helps
HOY = horizontal line, 0 slope, represented by x = a number
VUX = vertical line, undefined slope, represented by x = a number

undefined slope -- so its a vertical line
(5,-8)...remember, vertical lines are represented by x = a number....so we can say x = (now, what is the number for x in ur set of points ? it is 5...so ur equation is x = 5.  it does not matter what value y is, x is ALWAYS gonna be 5

Answer 2

An undefined slope is a vertical line.

And if it passes through (5, -8), then  x = 5.  Option C.