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x-y=0
2x=2 /:2
x=1
x+y=2
x=1
1+y=2
x=1
y=2-1
x=1
y=1
x=1
b){x+y=5 /*(-1)
x+y=5
-x-y=-5
x+y=5
0=0
c){x-1,1y=0,7 /*10
0,5x+1,1y=4,3 *10
10x-11y=7
5x+11y=43
15x=50 /15
x=50/15
10x-11y=7
x=50/15
10*50/15-11y=7
x=50/15
500/15-11y=7
x=50/15
-11y=7-500/15
x=50/15
-11y=-26 1/3
x=50/15
-11y=-79/3 /:(-11)
x=50/15
y=-7/3 * (-1/11)
x=50/15
y=7/33
x=50/15
d){-2y=4 /:(-2)
-x+3y=0
y=-2
-x+3*(-2)=0
y=-2
-x-6=0
y=-2
-x=6 /*(-1)
y=-2
x=-6