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Answer:

i am not sure thi sis the first one

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juju739
3(x+y) = 7(y-x)
3x+3y = 7y-7x
3x+7x +3y -7y = 0
10x - 5y = 0 —> *7
70x-35y = 0

5(3x-y)=x+3
15x-y =x+3
15x-x-y = 3
14x -y = 3 —>*5
70x-5y =15

70x-70x-5y-(-35y) = 15
30y = 15
y = 1/2

-2.5 +10x = 0
10x = 2.5
x = 0.25