Nene2001
Nene2001
18-03-2016
Mathematics
contestada
how to solve x-y=102x-y=17
Respuesta :
Trevish
Trevish
30-03-2016
x-y=10
2x-y=17
So to start
x=10+y
now replace x in the second equation
2(10+y) -y=17
20+2y-y=17
20+y=17
y=17-20
y=-3
Now replace y with -3 in any equation to find x
x-(-3) = 10
x+3=10
x=10-3
x=7
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