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0,3x-0,4y+0,5=0/*10
-X+4y=-7
+ 3x-4y=-5
-------------
2x=-12
x=-6
-6+4y=-7
4y=-1
y= -1/4
0,3x-0,4y+0,5=0
-x = -4y -7/: (-1)
0,3x-0,4y+0,5=0
x = 4y + 7
0,3(4y + 7) -0,4y+0,5=0
x = 4y + 7
1,2y + 2,1 - 0,4y + 0,5 =0
x = 4y + 7
0,8y + 2,6 = 0
x = 4y + 7
0,8y = -2,6/:0,8
x = 4y + 7
y = 3,25
x= 20
y = 3,25
0,3x-0,4y+0,5=0 /*10
-x+4y=-7
3x-4y=-5
2x=-12 /:(-2)
x=6
-6+4y=-7
4y=-1 /:4
y= -0,25