Answer:
f(x) = 3/4 * x - 3
Explanation:
f(x) = mx + b
m = (y - y') / (x - x') = (6 - 0) / (12 - 4) = 6 / 8 = 3/4
6 = 3/4 * 12 + b
b = -3
Equation: f(x) = 3/4 * x - 3
f (x) = ¾ x - 3
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