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7

Set 1: Systems Of Equations (Advanced)

Explanation

Answer: C

PROBLEM

Solve: x + 2y = 17, x + 3y = 20. Find x.

Solve: x + 2y = 17, x + 3y = 20. Find x.

A.

10

B.

9

C.

11

✓ Correct
D.

13

Detailed Explanation

Choice C is the best answer. Using elimination or substitution: x = 11

Why others are wrong:
A: 10 is incorrect because it does not satisfy the equation.
B: 9 is incorrect because it does not satisfy the equation.
D: 13 is incorrect because it does not satisfy the equation.
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