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0,3x-0,4y+0,5=0 /*10
-x+4y+7=0
3x-4y+5=0
-------------- +
2x+12=0
2x=-12
x=-6
-(-6)+4y+7=0
4y=-7-6
4y=-13
y=-13/4
y=-3,25
0,3x-0,4y+0,5=0
-x+4y= -7
0,3x-0,4y= -0,5/*10
-x= -7-4y/*(-1)
3x-4y= -5
x=7+4y
3(7+4y)-4y= -5
x=7+4y
21+12y-4y= -5
x=7+4y
8y= -5-21
x=7+4y
8y= -26/:8
x=7+4y
y= -3,25
x=7+4*(-3,25)
y= -3,25
x=7-13
y= -3,25
x= -6
y= -3,25