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8

Set 4: Linear Functions (Intermediate)

Explanation

Answer: B

PROBLEM

If f(x) = 3x + 3, for what x is f(x) = 15?

If f(x) = 3x + 3, for what x is f(x) = 15?

A.

6

B.

4

✓ Correct
C.

5

D.

3

Detailed Explanation

Choice B is the best answer. 3x + 3 = 15. 3x = 12, x = 4

Why others are wrong:
A: 6 is incorrect because it does not satisfy the equation.
C: 5 is incorrect because it does not satisfy the equation.
D: 3 is incorrect because it does not satisfy the equation.
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