Set 1: Systems Of Equations (Advanced)

**Choice B is the best answer.** Using elimination or substitution: x = 5

Explanation

Answer: B

PROBLEM

Solve: x + 3y = 20, 3x + 4y = 35. Find x.

✓ Correct

Detailed Explanation

Choice B is the best answer. Using elimination or substitution: x = 5

Why others are wrong:

A: 3 is incorrect because it does not satisfy the equation.

C: 7 is incorrect because it does not satisfy the equation.

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