exam Maths Puzzle Numerical Ability

i know how to do linear combination, but i cannot get the right answer for this problem:
2x+y+52=2y+50
2x+y+52=x-3y+131

I need help finding x and y.

Thank you!

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exam Other Question

If a small company produces both doll houses and sets of doll furniture. The doll houses take 3 hours of labor to produce, and the furniture sets take 8 hours. The labor availabl find the rate change of the line passing through (-1,4) and (3,2)