koalarules6 koalarules6

24-11-2016
Mathematics

contestada

-4x+8y=-256 -6y = x. how do u solve this equation by substitution.

Respuesta :

apologiabiology apologiabiology

24-11-2016

to make it soo much easier, divide top equation by 4
-x+2y=-64

now
-6y=x
sub -6y for x
-(-6y)+2y=-64
6y+2y=-64
8y=-64
divide both sides by 8
y=-8

sub back
-6y=x
-6(-8)=x
48=x

x=48
y=-8
(x,y)
(48,-8)

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