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2x+1y=620
2x+4y=1400
2x+1y=620
3y=780/:3
y=260
2x + 260 = 620
2x=620-260
2x=360
x=180
2)
2x+1y=2,80/*2
3x+2y=4,80
4x+2y=5,60
3x+2y=4,80
x=0,80
2*0,80+y=2,80
x=0,80
y=2,80-1,60
x=0,80
y=1,20
x=0,80
3)nie wiem