Estimate Value of a Function - Examples & Practice

Kayla's organization is selling sandwiches for a fundraiser. They had a stand set up for $10$ hours. Throughout the day, people took notes on how many sandwiches the organization sold every hour.

Take a look at the graph below.

The $x$-values are hours—for example, when $x = 1$, the organization has been selling for an hour. The $y$-values are the amount of sandwiches the organization sold that hour.

For example, they sold roughly $16$ sandwiches the second hour, since when $x = 2$, $y = 16$.