A(-2,-9) and B(-5,-8)
The equation form: y = mx + b. Calculate m, the slope:
m = (y₂-y₁) ÷ (x₂-x₁)→ m = [(-8) - (-9)] ÷ [(-5) - (-2)] →m = (-8+9)÷(-3) = -3
y = -3.x + b. To calculate b, plugin any of A or B coordinates, say A(-2,-9)
-9 = -3(-2)+b → b = -3
Finally te equation y = -3x -3
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2 inches of the model - 25 inches of the actual car
15 inches of the model - x inches of the actual car
The actual car is 187.5 inches long.
I have attached the graph