the answer is c. -2
to find slope you do
y2-y1/x2-x1
in this case it’s
-3-1/0- -2
which simplifies to
-4/2 = -2
X=5 becuase if 7*3=21 then x*3=15 and 5 times 3 = 15
So the answer is 12
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(Hopefully they're all right)