Answer:
If they have the same variable you add or subtract them.
Step-by-step explanation:
This is the answer I used a calculator $31,250
28.30 is the correct answer
Here slope is -2
and intercept is 4
so equation is
-2 x+4
if u have any doubt ask me
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2.5 because if you move x to the other side of the equation you will get y=2.5x, and the constant of proportionality is what x is multiplied by, in this case, it's 2.5.