oliviaparker2010 oliviaparker2010
  • 05-02-2019
  • Mathematics
contestada

what is the solution? 1/4x-1/2y=8 1/2x+3/4y=-5

Respuesta :

carlosego
carlosego carlosego
  • 05-02-2019

Answer:  x=8; y=-12


Step-by-step explanation:

1. You can apply the Elimination method:

- Mulitply the first equation by -2:

 [tex]-2(1/4x-1/2y)=8(-2)[/tex]

[tex]-1/2x+y=-16[/tex]

- Sum both equations and solve for y:

[tex]-1/2x+y=-16 \\1/2x+3/4y=-5\\----------\\7/4y=-21\\y=-12[/tex]

- Substitute the value obtained (y=-12) in one the original equations and then solve for x:

[tex]1/4x-1/2(-12)=8\\1/4x=2\\x=8[/tex]


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