6

Set 3: Systems Of Equations (Intermediate)

Explanation

Answer: C

PROBLEM

Solve: x + y = 9, 2x + 4y = 30. Find x.

Solve: x + y = 9, 2x + 4y = 30. Find x.

A.

5

B.

1

C.

3

✓ Correct
D.

4

Detailed Explanation

Choice C 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.
D: 4 is incorrect because it does not satisfy the equation.