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narty- 3 x
kombinezon - x
840 zl= x + 3x
840= 4x
840 zl : 4= 210 zl
kombinezon= 210 zl
narty= 630 zl
y - kombinezon
x + y = 840
3y = x
3y + y = 840
4y = 840 : 4
y = 210 zł
x = 3y
x = 3 * 210
x = 630 zł
Odp: Narty kosztują 630 zł, a kombinezon 210 zł
3x- cena nart
x+3x=840
x+3x=840
4x=840 /:4
x = 210
spr.
210+630=840