Which pair of slopes could represent parallel lines?

m = 7; m = 49
m = 2/7; m = 7/2
m = -3, m = -9/3
m = -1/2, m = -2

M = -3, m = -9/3

because when you divide -9/3, you get -3, so the slopes would be the same.
If the slopes are the same (and their intercepts are different) then that pair of slopes represents parallel lines!

1+1=22×1=22-1=11-1=1duh

Idk what the answer is bc i don't get it