Janessa73
Janessa73
27-03-2015
Mathematics
contestada
5x+2y=21-x-y=-9 what is the answer
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Panoyin
Panoyin
04-04-2015
5x + 2y = 21 ⇒ 5x + 2y = 21
-1x - 1y = -9 ⇒
5x + 5y = 45
-3y
=
-24
-3 -3
y = 8
5x + 2(8) = 21
5x + 16 = 21
- 16 - 16
5x
=
5
5 5
x = 1
(x, y) = (1, 8)
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