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Answer: CSet 3: Systems Of Equations (Advanced)
Explanation
PROBLEM
Solve: 5x + y = 50, 3x + 3y = 42. Find y.
Solve: 5x + y = 50, 3x + 3y = 42. Find y.
A.
7
B.
3
C.✓ Correct
5
D.
4
Detailed Explanation
Choice C is the best answer. Using elimination or substitution: y = 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.
D: 4 is incorrect because it does not satisfy the equation.