Crystia Crystia

15-12-2016
Mathematics

contestada

9x-3y=3; 3x+8y=-17

I want to know the steps and answers

Respuesta :

WolfLover181957 WolfLover181957

15-12-2016

9x - 3y=3
(-)9x+16y=-51. (Multiply by 3)

-19x=54

X= -54/19

Answer Link

Apocrophon Apocrophon

15-12-2016

9x-3y=3
3x+8y=-17

9x-3y=3
9x-3=3y
3y=9x-3
y=x-1
plug it into the other equation

3x-8y=-17
3x - 8(x-1) = -17
-5x + 8 = -17
-5x = -25
x = 5
plug it in again

y = x - 1
y = 5-1
y = 4

Answer Link

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