5
Answer: CSet 4: Systems Of Equations (Intermediate)
Explanation
PROBLEM
Solve: 3x + 5y = 77, 5x + 3y = 75. Find y.
Solve: 3x + 5y = 77, 5x + 3y = 75. Find y.
A.
12
B.
9
C.✓ Correct
10
D.
11
Detailed Explanation
Choice C is the best answer. Using elimination or substitution: y = 10
Why others are wrong:
A: 12 is incorrect because it does not satisfy the equation.
B: 9 is incorrect because it does not satisfy the equation.
D: 11 is incorrect because it does not satisfy the equation.