$k$k represents the number of basketballs used during a training session.

The picture below shows the basketballs that were used for training last Saturday. What is the value of $k$k in this case?

$x$x represents the number of cupcakes baked for a party.

The picture below shows the number of cupcakes made for Oprah's party. What is the value of $x$x in this case?

Let $p$p represent "the number of tennis balls in a pack".

Let $x$x represent "a number of squares".

Use graphs, tables, and rules to describe linear relationships found in number and spatial patterns