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9

Set 3: Systems Of Equations (Beginner)

Explanation

Answer: C

PROBLEM

Solve: 5x + 4y = 72, 4x + 2y = 48. Find x.

Solve: 5x + 4y = 72, 4x + 2y = 48. Find x.

A.

10

B.

7

C.

8

✓ Correct
D.

9

Detailed Explanation

Choice C is the best answer. Using elimination or substitution: x = 8

Why others are wrong:
A: 10 is incorrect because it does not satisfy the equation.
B: 7 is incorrect because it does not satisfy the equation.
D: 9 is incorrect because it does not satisfy the equation.
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