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0,8x +y = 55
y=5-x
0,8x +5-x =55
y=5-x
-0,2x =50 /:(-0,2)
y=5-x
x=-250
y=5-(-250)
x=-250
y=255
x=-250
0,8(5-y)+y=59-4
4-0,8y+y=55
0,2y=51/*5
y=255
{ x=5-y
{ x= 5-255
x= (-250)
czyli
x to -250, a y to 255.