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8

Set 4: Systems Of Equations (Beginner)

Explanation

Answer: B

PROBLEM

Solve: 4x + 2y = 30, 3x + 4y = 40. Find x.

Solve: 4x + 2y = 30, 3x + 4y = 40. Find x.

A.

5

B.

4

✓ Correct
C.

6

D.

3

Detailed Explanation

Choice B is the best answer. Using elimination or substitution: x = 4

Why others are wrong:
A: 5 is incorrect because it does not satisfy the equation.
C: 6 is incorrect because it does not satisfy the equation.
D: 3 is incorrect because it does not satisfy the equation.
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