2x-3y=9; 2x+y=13 Wh Ich ans
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2x-3y=9,
2x+y=13,
-3y-y=9-13,
-4y=-4,
y=1,
then
2x+1=13,
2x=12,
x=6
2x+y=13,
-3y-y=9-13,
-4y=-4,
y=1,
then
2x+1=13,
2x=12,
x=6
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