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X+y=-4 -x+2y=13 can someone please help me with this I dont understand this

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Eu99liid
{ x+y=-4
{-x+2y=13        (+)
x+(-x)+y+2y=-4+13
3y=9    /:3
y=3

x+y=4

x+3=4  /-3
x=1

Answer: y=3, x=1

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