guerrerogi guerrerogi
  • 03-10-2017
  • Mathematics
contestada

anyone know how to do this one?
2x+7y=-1
4x-3y=-19

Respuesta :

choixongdong
choixongdong choixongdong
  • 03-10-2017
2x+7y=-1  (1)
4x-3y=-19 (2)

multiply equation (1) by 2
4x + 14y = -2 (1')
4x - 3y =  -19 (2)
---------------------subtract
17y = 17
 y = 1

2x+7y=-1
2x+7(1)=-1
2x + 7 = -1
2x = -8
  x = -4

answer
(-4, 1)
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