Question

Is the slope of a line through points (4,6) and (-2,6) zero or undefined?

Answer 1

notice how the y coordinates are both 6

so you'll have y2 - y1 = 6-6 = 0 in the numerator

0 over any number (but 0 itself) is always 0

Answer 2

I'm using the slope formula

m = (y2 - y1)/(x2 - x1)

Answer 3

y1-y2/x1-x2=m
m=slope
1/0 will always be undefined
0/1 is always zero.

Answer 4

Thanks guys! I knew how to find the slope I just didn't know how to tell if it was zero or undefined!