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x=o => y= -8
y=o => x= 4
{4, -8}
x - 3y = 9
x=0 => y=-3
y=o => x=9
{9,-3}
x-3y=9 |4|4x-12y=36
12y-2y=10y x-3y=9
36-16=20 x-3(2)=9
x=9+6=15
y=2 x=15