Question

Which of the following functions has the steepest slope?

A. Y=-3x-6
B. Y=c+6
C. Y=6x-9
D. Y=2x+12

Answer 1

your options are all in the slope intercept format
which is
y = mx + b
where m is the slope

so for
A, your slope is -3
B, slope is 1 (?) [you made a typo]
C, slope if 6
D, slope is 2

the biggest number here is 6
therefore C has your steepest slope