If 3a + 2b = 18 and a = 4, what is the value of b?
Answer and explanation
Correct answer: A. 3
- Step 1: Substitute a = 4 into the equation: 3(4) + 2b = 18 -> 12 + 2b = 18. Step 2. Subtract 12: 2b = 6. Divide by 2: b = 3. Answer: 3. Why not the others: 2 gives 12 + 4 = 16 != 18; 4 gives 12 + 8 = 20 != 18; 5 gives 12 + 10 = 22 != 18.
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