We want to know how money Jessie's friend would need if he wants to ride 6 rides.
We know that the Amusement Park charges a $7 admission fee plus $1.75 per ride. We can write this as:
[tex]y=1.75x+7[/tex]Where y is the cost of doing x rides on the amusement park. If we want to find the cost for 6 rides, then we should replace x for 6, and we get:
[tex]\begin{gathered} y=1.75(6)+7 \\ =10.5+7 \\ =17.5 \end{gathered}[/tex]This means that the cost of Jessie's friend for 6 rides would be $17.5.