3x-4y=-5 /*-2
2x-3y=7 /*-3
6x-8y=-10
-6x+9y=-21
--------------
y=-31
2x-3*-31=7
2x+93=7
2x=7-93
2x=-86
x=-43
spr.3*-43-4*-31=-129+124=-5
-2x+y=-4 /*4
8x+5y=-11
-8x+4y=-16
---------------
9y=-27
y=-3
-2x-3=-4
-2x=-4+3
-2x==-1 /:-2
x=1/2
spr.-2*1/2-3=-1-3=-4
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3x-4y=-5 /*-2
2x-3y=7 /*-3
6x-8y=-10
-6x+9y=-21
--------------
y=-31
2x-3*-31=7
2x+93=7
2x=7-93
2x=-86
x=-43
spr.3*-43-4*-31=-129+124=-5
-2x+y=-4 /*4
8x+5y=-11
-8x+4y=-16
8x+5y=-11
---------------
9y=-27
y=-3
-2x-3=-4
-2x=-4+3
-2x==-1 /:-2
x=1/2
spr.-2*1/2-3=-1-3=-4