avila001 avila001
  • 03-08-2018
  • Mathematics
contestada

y=1/3x - 4
y=-7/3x +4 in substitution

Respuesta :

rejkjavik rejkjavik
  • 03-08-2018

we are given

[tex] y=\frac{1}{3} x-4 [/tex]...........(1)

[tex] y=-\frac{7}{3} x+4 [/tex]...........(2)

we can plug second equation into first one

[tex] -\frac{7}{3} x+4=\frac{1}{3} x-4 [/tex]

now, we can solve for x

[tex] \frac{7}{3} x+\frac{1}{3} x=4+4 [/tex]

[tex] \frac{8}{3} x=8 [/tex]

[tex] x=8*\frac{3}{8} [/tex]

[tex] x=3 [/tex]

now, we can find y

[tex] y=\frac{1}{3} *3-4 [/tex]

[tex] y=-3 [/tex]

so, we will get solution as

[tex] (x,y)=(3,-3) [/tex].............Answer

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