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:

$\frac{19.60}{8}=2.45$

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:

$\begin{gathered} x=\frac{10\cdot19.60}{8} \\ \frac{x}{19.60}=\frac{10}{8} \end{gathered}$