In the chapter Demand we have seen that in the point of ; price of related goods .
Price of substitute goods increase then demand for given commodity will rise because of relatively cheaper .

But now in the chapter of Supply there is ; as price increases , the quantity supplied also rises because at higher prices , there is a greater chance of making profits.

So my question is that a commodity is supplied in the market because of its demand in the market .Then why the quantity supplied rises when price of a commodity increases.