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8

Set 4: Systems Of Equations (Intermediate)

Explanation

Answer: D

PROBLEM

Solve: 4x + 3y = 30, 4x + 5y = 42. Find x.

Solve: 4x + 3y = 30, 4x + 5y = 42. Find x.

A.

5

B.

1

C.

4

D.

3

✓ Correct

Detailed Explanation

Choice D is the best answer. Using elimination or substitution: x = 3

Why others are wrong:
A: 5 is incorrect because it does not satisfy the equation.
B: 1 is incorrect because it does not satisfy the equation.
C: 4 is incorrect because it does not satisfy the equation.
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