step 1
Find the slope
we take the points
(5,-30) and (8, -48)
m=(-48+30)/(8-5)
m=-18/3
m=-6
step 2
Find the equation of the line in slope intercept form
y=mx+b
we have
point (5,-30)
substitute
-30=-6(5)+b
-30=-30+b
b=0
therefore
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