courtneygaffney4755
courtneygaffney4755 courtneygaffney4755
  • 14-01-2019
  • Mathematics
contestada

can someone explain how to do this please?

can someone explain how to do this please class=

Respuesta :

jdoe0001 jdoe0001
  • 14-01-2019

[tex]\bf \begin{cases} \boxed{y}=-2x\\\\ -x-y=4 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{since we know what \boxed{y} is, let's substitute it in the 2nd equation}}{-x-\left( \boxed{-2x} \right)=4\implies -x+2x=4\implies x=4} \\\\[-0.35em] ~\dotfill\\\\ y=-2x\implies y=-2(4)\implies y=-8 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (4,-8)~\hfill[/tex]

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