kimbriea
kimbriea kimbriea
  • 20-04-2015
  • Mathematics
contestada

how to solve 2x-y=17;x-y=10

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julxaaaa
julxaaaa julxaaaa
  • 20-04-2015
the answer is that y is equal to -3 and x is equal to 7 
2x-y=17
-2(x-y)=10 )
--------------
2x-y=17
-2x+2y=-20
----------------
y=-3

x-y=10 
x-(-3)=10
x+3=10
 -3   -3
----------
x=7



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