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4

Set 2: Systems Of Equations (Advanced)

Explanation

Answer: C

PROBLEM

Solve: 2x + 2y = 30, x + 2y = 20. Find x.

Solve: 2x + 2y = 30, x + 2y = 20. Find x.

A.

8

B.

11

C.

10

✓ Correct
D.

9

Detailed Explanation

Choice C is the best answer. Using elimination or substitution: x = 10

Why others are wrong:
A: 8 is incorrect because it does not satisfy the equation.
B: 11 is incorrect because it does not satisfy the equation.
D: 9 is incorrect because it does not satisfy the equation.
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