Answer:
-4
Step-by-step explanation:
y=-4x-9
y=mx+b
m=slope
18 divided by (-9) equals -2.
Two positives make a positive
two negatives make a positive
1 negative and 1 positive make negative
1 positive and 1 negative make a negative
U=5
x=1
z=-1.7
m=2
Trololololololo