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x+x+2y-4y=-3+5
-3x-x+8y+6y=4-5
2x-2y=2 /:2
-4x+14y=-1
x-y=1→x=1+y
-4(1+y)+14y=-1
x=1+y
-4-4y+14y=-1
10y=-1+4
10y=3
y=0,3
x=1+y=1+0,3=1,3
spr.1,3-0,3=1
1=1
-4×1,3+14×0,3=-1
-5,2+4,2=-1
-1=-1
-3x+8y+5=x-6y+4
x+x+2y-4y=5-3
-3x-x+8y+6y=4-5
2x-2y=2 /*2 ------> 2x- 2(-3/18)= 2
-4x+14y=-1 2x + 6/18 =2
2x= 2-6/18
4x-2y=4 2x= 1 12/18 /:2
-4x-14y=-1 x= 30/36 = 15/18
+____________
-16y=3 /: (-16)
y= -3/18 (jako ułamek- ukośnik to kreska ułąmkowa)