rodriguez1414 rodriguez1414

09-01-2015
Mathematics

contestada

Solve by the elimination method.
6x+9y=57
-6x+y=33

Respuesta :

16-01-2015

6x+9y=57
-6x+y=33

------------------ (+)

6x+(-6x)+9y+y=57+33

10y=90 /:10

y=9

-6x+y=33

-6x+9=33 /-9

-6x=24 /:(-6)

x=-4

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