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x-y=0
...............
2x=2/:2
x=1
x=1
1-y=0
x=1
y=1
b)2x+y=15
x-y=0
.............
3x=15/:3
x=5
x=5
y=5
c)y=x+5
581x+y=5
y=x+5
581x+x+5=5
y=x+5
582x=0
x=0
y=5