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y - cena brulionu
x+y = 6,30
x = 0,75y
0,75y+y = 6,3
1,75y = 6,3 /:1,75
y = 3,6
x = 0,75*3,6 = 2,7
Odp: Zeszyt kosztuje 2,70zł, a brulion 3,60zł.
y-cena zeszytu
x+y=6,30
y=75%x
x+0,75x=6,30
y=0,75x
1,75x=6,30/:1,75
y=0,75x
x=3,60
y=0,75*3,60
x=3,60 - cena brulionu
y=2,70 -cenA zeszytu