31-01-2014
Mathematics

contestada

X=7y-9
X+7y=8

Need help using substitution. ?! Please

Respuesta :

31-01-2014

X=7y-9
X=-7y+8
7y-9=-7y+8
+9= +9
7y=-7y+17
+7y=+7y
14y=17
14y/14=17/14
Y=17/14

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