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-2x+3y=1,1 /*2
4x - 5y = -4
-4x + 6y = 2,2
y= -4 +2,2
y= -1,8
4x= -13 /:4
x= - 3,25
b)-2x+y=0
3x-3y=1
-6x +3y =0
3x-3y = 1
-3x= 1 /:-3
x= -1/3
-6 * (-1/3) +3y = 0
3y= -2 /:3
y= -2/3
c)3x-2y=-12 /*2
2x-5y=-19 /*(-3)
6x - 4y = -24
-6x + 15y = 57
11y= 33 /:11
y= 3
3x- 2*3= -12
3x= -12+6
3x= 6 /:3
x=2