koalarules6
contestada

guys i need help with solving the system of equations and combining the equations. also show your work. the equations are x-4y=-12 and 4x-y=12. i need the answer in coordinates. i only need help with 3 questions with this.

Respuesta :

apologiabiology
x-4y=-12
4x-y=12

eliminate y's
multily 2nd equaiton by -4 and add to top one

x-4y=-12
-16x+4y=-48 +
-15x+0y=-60

-15x=-60
divide both sides by -15
x=4
sub back
x-4y=-12
4-4y=-12
minus 4 both sides
-4y=-16
divide both sides by -4
y=4

x=4
y=4
(x,y)
(4,4)

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