ashleyaddison ashleyaddison

11-08-2017
Mathematics

contestada

w many solutions does this linear system have?y = 2x – 5 –8x – 4y = –20

Respuesta :

kphung76127 kphung76127

11-08-2017

Using substitution

-8x-4(2x-5)=-20
-8x-8x+20=-20
-16x+20=-20
-16x=-40
x=2.5

Plug x into one of the original equations.
y=2(2.5)-5
y=5-5
y=0

Final answer: 1 solution (2.5, 0)

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