Answer
a. y=-50x + 700
b. 325
Work Step by Step
a. $(10,200), (9,250 ) =\gt \frac{250-200}{9-10}=\frac{50}{-1}=-50$
$y=-50x+b =\gt 200=-50\times10 +b \lt=\gt b = 700$
b. x=7.5 , y=325
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