Answer:
x = 2
Step-by-step explanation:
AB/BC = AD/DE
= 
cross-multiply:
2+x = 4
x = 2
This is the answer...
y=250-25x
y=30+30x
The answer is 1 Bcuz u have to first plug in -4 for f then solve the equation by adding like terms and dividing
(Y-Y1)/(X-X1)
(-9-(-29))/(7-15)
20/-8
-2 1/2
The slope is -2 1/2