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y=cena zakupu kurtki
12x+15y=13 500zł
x=y+180
12(y+180)+15y=13500
12y+2160+15y=13500
27y=13500-2160
27y=11340
y=11340:27
y=420= cena zakupu kurtki
x=y+180=420+180=600 zł= cena zakupu płaszcza
k-cena zakupu kurtki
{12p+15k=13500
{p=k+180
12(k+180)+15k=13500
12k+2160+15k=13500
27k=11340
k=420 - cena kurtki
p=420+180
p=600 - cena płaszcza