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snow_lady [41]
3 years ago
9

X + y = k

Mathematics
1 answer:
lisov135 [29]3 years ago
7 0
If x+y=k, then x=k-y. Substitute k-y for x in the other equation. So (k-y)-y=k. k-2y =k which means y has to be 0 (both k's subtract on both sides). -2y=0. The answer: (k,0). For the second part, get all the parts of the equations on both sides; (make both sides equal zero) 3x-4y-7 and 3x+2y+5. Then subtract. 3x-4y-7-(3x+2y+5) Make it equal to zero again and solve! :) -6y-12=0 -6y=12!! ta da!
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