9
Answer: CSet 2: Systems Of Equations (Intermediate)
Explanation
PROBLEM
Solve: 4x + 3y = 39, 5x + 4y = 51. Find y.
Solve: 4x + 3y = 39, 5x + 4y = 51. Find y.
A.
10
B.
7
C.✓ Correct
9
D.
8
Detailed Explanation
Choice C is the best answer. Using elimination or substitution: y = 9
Why others are wrong:
A: 10 is incorrect because it does not satisfy the equation.
B: 7 is incorrect because it does not satisfy the equation.
D: 8 is incorrect because it does not satisfy the equation.