How do you solve the following system?: $7x +2y =-2 , -4x +5y = 4$

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Answer 1 · 2018-03-29T10:53:23

$x=-18/43$ and $y=20/43$

$4*(7x+2y)+7*(-4x+5y)=4*(-2)+7*4$

$28x+8y-28x+35y=-8+28$

$43y=20$ , so $y=20/43$

Hence,

$-4x+5*20/43=4$

$-4x=(172-100)/43$

$-4x=72/43$ , so $x=-18/43$

How do you solve the following system?: 7x +2y =-2 , -4x +5y = 47x +2y =-2 , -4x +5y = 4