Question

8 books cost 19.60$ what would help detemine the cost of 10 bookswhich equation would help determine the cost of 10 books

Answer 1

we can find the cost of one book, that will be the growth rate so for that we can divide the the cost by the number of books so:

`(19.60)/(8)=2.45`

this mean that each book cost $2.45 dollars so the equation will be: ( y is the total cost and x the number of books so)

`y=2.45x`

So if we want to calculate the cost of 10 books we replace x=10 so:

`y=2.45\cdot10=24.5`

So ten books cost $24.5 dollars

Another for to solve it is with a rule of 3 so the new equation will be:

`\begin{gathered} x=(10\cdot19.60)/(8) \\ (x)/(19.60)=(10)/(8) \end{gathered}`