PSAT Math Grid-Ins Question 121: Answer and Explanation
Question: 121
If 2x + 3 = 4, what is the value of 6x + 9?
Correct Answer: 12
Explanation:
12 Triple the given equation 2x + 3 = 4 to give you the equation 6x + 9 = 12:
2x + 3 = 4 → 3 · 2x + 3 · 3 = 3 · 4 → 6x + 9 = 12
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