7
Answer: ASet 4: Systems Of Equations (Intermediate)
Explanation
PROBLEM
Solve: 4x + y = 22, 3x + 3y = 21. Find x.
Solve: 4x + y = 22, 3x + 3y = 21. Find x.
A.✓ Correct
5
B.
7
C.
3
D.
6
Detailed Explanation
Choice A is the best answer. Using elimination or substitution: x = 5
Why others are wrong:
B: 7 is incorrect because it does not satisfy the equation.
C: 3 is incorrect because it does not satisfy the equation.
D: 6 is incorrect because it does not satisfy the equation.