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Mark Jerzykowski · Answer 1 · 2018-09-10T16:20:42+0000

Formular for line graph is

y=mx+b

Find the gradient first

${ (y1-y2)/(x1-x2) } \\ \\ = { (0-80)/(0-10) } \\ \\ = { (-80)/(-10) } \\ \\ = 8$

Substitude the gradient to the formular

$80=8(10)+b \\ \\ b=0$

∴ m=8h is the equation of the graph.

Answer is C.

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