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6

Set 1: Systems Of Equations (Beginner)

Explanation

Answer: C

PROBLEM

Solve: 3x + y = 15, x + 2y = 15. Find y.

Solve: 3x + y = 15, x + 2y = 15. Find y.

A.

4

B.

5

C.

6

✓ Correct
D.

7

Detailed Explanation

Choice C is the best answer. Using elimination or substitution: y = 6

Why others are wrong:
A: 4 is incorrect because it does not satisfy the equation.
B: 5 is incorrect because it does not satisfy the equation.
D: 7 is incorrect because it does not satisfy the equation.
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