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{x+1,8=y
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{0,5x+1,5*(x+1,8)=7,5
{y=x+1,8
---
{0,5x+1,5x+2,7=7,5
{y=x+1,8
---
{2x=7,5-2,7
{y=x+1,8
---
{2x=4,8 |:2
{y=x+1,8
---
{x=2,4
{y=2,4+1,8
---
{x=2,4
{y=4,2
Kilogram jabłek kosztuje 2,4, a kilogram gruszek 4,2.