9
Answer: ASet 2: Systems Of Equations (Advanced)
Explanation
PROBLEM
Solve: x + 5y = 40, 3x + 4y = 43. Find x.
Solve: x + 5y = 40, 3x + 4y = 43. Find x.
A.✓ Correct
5
B.
7
C.
6
D.
3
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: 6 is incorrect because it does not satisfy the equation.
D: 3 is incorrect because it does not satisfy the equation.