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6

Set 5: Systems Of Equations (Intermediate)

Explanation

Answer: B

PROBLEM

Solve: 3x + 5y = 70, 4x + 5y = 80. Find x.

Solve: 3x + 5y = 70, 4x + 5y = 80. Find x.

A.

12

B.

10

✓ Correct
C.

8

D.

9

Detailed Explanation

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

Why others are wrong:
A: 12 is incorrect because it does not satisfy the equation.
C: 8 is incorrect because it does not satisfy the equation.
D: 9 is incorrect because it does not satisfy the equation.
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