Question

1) In
2) 3x-7y=15, 7x-3y=25 find x + y, x-y.

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Answer 1

Answer:

x-y=4,x+y=5/2

Explanation:

3x-7y+7x-3y=15+25

10x-10y=40

10(x-y)=40

x-y=40/10=4

3x-7y-(7x-3y)=15-25

3x-7y-7x+3y=-10

-4x-4y=-10

-4(x+y)=-10

x+y=-10/-4=5/2