boo71
boo71
12-03-2015
Mathematics
contestada
3x-y=-1 and 2x+y=-14 how to solve showing work?
Respuesta :
Panoyin
Panoyin
13-03-2015
3x - y = -1 ⇒ 6x - 3y = -2
2x + y = -14 ⇒
6x + 2y = -42
-5y
=
40
-5 -5
y = -8
3x - (-8) = -1
3x + 8 = -1
-8 -8
3x
=
-9
3 3
x = -3
(x, y) = (-3, -8)
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