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3x-y=5 2x+3y=11
5x=10 /:5
x=2 2x-2y=6 2x+3y=11
x=2 y=5
2x+y=5
y=5
x=2 x-y=3
4+y=5 /-4
y=5
x=2 x-5=3 /+5
y=1
y=5
x=8
c)2x+3y=5
x+y=1 /*(-2)
2x+3y=5
-2x-2y=-2
y=3
y=3
x+y=1
y=3
x+3=1 /-3
y=3
x=-2