równanie
x+y=45
0,8x+3/4y=35
daje naj !
x+y=45|*(-3)
0,8x+3/4y=35|*4
-3x-3y=-135
3,2x+3y=140
___________
0,2x=5
x=5
5+y=45
y=40
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x+y=45|*(-3)
0,8x+3/4y=35|*4
-3x-3y=-135
3,2x+3y=140
___________
0,2x=5
x=5
5+y=45
y=40
x=5
y=40