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y- cena 1 kiwi
2x+6y=4,50
x=1,5y
2×1,5y+6y=4,50
3y+6y=4,5
9y=4,50
y=0,5zł
x=1,5y=1,5×0,5=0,75zł
spr. 2x+6y=4,5
2×0,75+6×0,5=1,5+3=4,5zł
odp ,grapefruit kosztował 75gr. a 1 kiwi 50 gr
kiwi x
2*1,5x+6x=4,5
3x+6x=4,5
9x=4,5 |:9
x=0,5
grapefruit 0,75
kiwi 0,5
1,5x - cena grejpfruta
2*1,5x+6x=4,5
3x+6x=4,5
9x=4,5/9
x=0,5
1,5x=1,5*0,5=0,75