Answer:
C
Explanation:
If you use substitution, you will figure out that x=350-y, and 3x=1050-3y. If you plug this into the equation, 1050-3y+7y=2050.
Simplifying, we get 1050+4y=2050, and 4y=1000.
Divide each side by 4 to get y=250.
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