Question

solve the system of equation y-x=10 2x+y=40

Answer 1

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y = 10 + x

Put y in 2x + y = 40

2x + 10 + x = 40

3x = 40 - 10

x = 30/3 = 10.

put x in any equation ..

y - 10 = 10

y = 10 + 10 = 20 .