# Hard SAT Math Question 5 — Video Explanation | 1600.now

Source: https://1600.now/hard/5

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5

$f(x) = 18x + b$  
For the given function $f(x)$, which of the following represents the equation for the function $3f(x)$, given that the point $(-2, -20)$ lies on the graph of $f(x) - 10$?

A

$18x - 78$

B

$54x + 78$

C

$18x + 6$

D

$54x - 6$