16-02-2017
Mathematics

contestada

How to solve this equation by elimination?<br />
2x+5y=4 and 7x+y=-19

Respuesta :

17-02-2017

Multiply 7x+y=-19 by 5 to have the same value of y. Then subtract one from the other.

35x+5y=-95
-
2x+5y=4.

You get a result of 33x=-99
X=-3

Substitute the x into one of the original equations.

2*-3 +5y= 4
5y=4+6
Y=2

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