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x + 1 - cena zeszytu
3 (x+1) + 5x = 17
3x + 3 + 5x = 17
8x = 14
x = 1.75 - pisak
1.75 + 1 = 2.75 - zeszyt
x-pisak
5x + 3y =17
y+1=x
5x+3y=17
y-x=-1 /*(-3)
5x+3y=17
3x-3y=3
8x=20 /8
x= 2.5
2.5 *5 = 12.5
17-12.5= 4.5
4.15 : 3= 1.5