Set 1: Systems Of Equations (Intermediate)

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

Explanation

Answer: D

PROBLEM

Solve: x + y = 15, x + 2y = 25. Find x.

✓ Correct

Detailed Explanation

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

Why others are wrong:

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

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

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