Answer:
C
Step-by-step explanation:
Add 10x to both sides:
-10x - 135 = 117 + 2x
-10x - 135 + 10x = 117 + 2x + 10x
-135 = 117 + 12x
Subtract 117 from both sides:
-135 - 117 = 117 + 12x - 117
-252 = 12x
Divide both sides by 12:

-21 = x
So the answer is C.
Hope this helps!
The decimal of the fraction 2/7 is 0.2857142857
1 gallon is $4.20
16.80/5=4.20
Okay well, just by looking at the graph. It’s a negative slope and the only answer, that has a negative is the 3 one.