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3 years ago

11

10x + 7y = -3 5x - y = 3

1 answer:

rodikova [14]3 years ago

5 0

If this is a system of equations then:
Multiply 5x-y=3 by -2
=> -10x+2y=-6
Now you sum the equations:
10x-10x+7y+2y=-3-6
=> 9y=-9
Then just divide by 9: y=-1
Now to get x, choose one of the equations and use the value we got from y:
5x-(-1)=3 => 5x+1=3 => 5x=3-1
=> 5x=2
=> x=2/5

(x,y)=(2/5, -1)

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------------

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