KanelacoolShellace KanelacoolShellace

31-12-2016
Mathematics

contestada

If 2x + 5y = 21 and x + y = 3, then what is the solution

(-2, 5)

(-5, -2)

(5, -2)

(-2, -5)

Respuesta :

kaivalyashenoy kaivalyashenoy

31-12-2016

2x+5y=21, x+y=3
y=3-x
2x+5y=21
2x+5(3-x) =21
2x+15-5x=21
2x-5x+15=21
-3x+15=21
-3x=21-15
-x=6/3
-x=2
x=-2

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