Respuesta :

Solution = (5,-5)



Step-by-step: for substitution


Isolate the x in 3x+6y=-15


===> x=-2y-5

Substitute the x in -7x-3y=-20 for -2y-5.


-7(-2y-5)-3y=-20

14y+35-3y=-20

11y=-55

Y=-5



Substitute the y in 3x+6y=-15 for -5


3x+6(-5)=-15

3x-30=-15

3x=15

X=5


(5,-5)

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