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8

Set 1: Systems Of Equations (Advanced)

Explanation

Answer: D

PROBLEM

Solve: 2x + 4y = 56, 2x + 5y = 66. Find y.

Solve: 2x + 4y = 56, 2x + 5y = 66. Find y.

A.

9

B.

11

C.

12

D.

10

✓ Correct

Detailed Explanation

Choice D is the best answer. Using elimination or substitution: y = 10

Why others are wrong:
A: 9 is incorrect because it does not satisfy the equation.
B: 11 is incorrect because it does not satisfy the equation.
C: 12 is incorrect because it does not satisfy the equation.
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