guerrerogi guerrerogi
  • 03-10-2017
  • Mathematics
contestada

does anyone know
2x=8y=7
4x-2y=9

Respuesta :

coolstick
coolstick coolstick
  • 03-10-2017
Assuming you mean 2x-8y=7, we can start by multiplying the first equation by -2 and adding it to the second (to cross out the x), resulting in -18y=-5. After that, we can divide both sides by -18, resulting in y=5/18. Next, plugging that into 4x-2y=9, we have 4x-10/18=9. Adding 10/18 to both sides, we get 4x=9+10/18. After that, we can divide both sides by 4, resulting in x=(9+10/18)/4=
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