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y - ławka
x-1=y
2y=x+1
x-y=1
-x+2y=1
y=2
x-2=1
x=1+2
x=3
kawek bylo 3 a lawek 2
y- liczba kawek
x + 1 = y
x - 1 = 0,5y
x + 1 = y
x-1=0,5*(x+1)
x + 1 = y
x-1=0,5x+0,5
x + 1 = y
x-0,5x=1+0,5
x + 1 = y
0,5x=1,5 |:0,5
x + 1 = y
x=3
3 + 1 = y
x=3
x=3
y=4
Odp: Były 4 kawki i 3 ławki.
y - ilość ławek
x/4 = y + 1
x/5 = y - 1
x = 4x + 4
x = 5y - 5
5y - 5 = 4y ++ 4
x = 5y - 5
5y - 4y = 4 + 5
x = 5y - 5
y = 9
x= 5 × 9 -5 = 40
Kawek było 40 a ławek 9