ACT 2020 June(C02) Math Question 11 Explanation - ACT Helper

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2020 June(C02) Math Question 11
Equation of a Line
- Equations that Describe a Line
Choice A
$f (x) = m x + b$ $6 = m (8) + b - - - (1)$ $9 = m (12) + b - - - (2)$ $(2) - (1)$ $\Rightarrow 3 = 4 m$ $\Rightarrow m = \frac{3}{4}$ $f (x) = \frac{3}{4} x + b$ $6 = 6 + b$ $b = 0$ $f (n) = \frac{3}{4} n$
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