mimi12
mimi12
26-02-2015
Mathematics
contestada
how to solve 2x+y=2 and x+y=-1
Respuesta :
apologiabiology
apologiabiology
26-02-2015
so
2x+y=2
x+y=-1
multiply secion equation by -1
-x-y=1
add to first equation
2x-x+y-y=2+1
x=3
subsitute
3+y=-1
subtract 3
y=-4
x=3
y=-4
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