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4

Set 3: Systems Of Equations (Advanced)

Explanation

Answer: A

PROBLEM

Solve: x + 5y = 54, 2x + 5y = 63. Find x.

Solve: x + 5y = 54, 2x + 5y = 63. Find x.

A.

9

✓ Correct
B.

7

C.

8

D.

11

Detailed Explanation

Choice A is the best answer. Using elimination or substitution: x = 9

Why others are wrong:
B: 7 is incorrect because it does not satisfy the equation.
C: 8 is incorrect because it does not satisfy the equation.
D: 11 is incorrect because it does not satisfy the equation.
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