Initial deposit is ----------------------- >$7.50
Julian fees per day for unlimited golf is-------------- >(30-10)= $20
View table-chart attached
Julian has ------ > $375-$7.50(Initial deposit)= $367.50
Per day--------------- >$20
X-------------------- >$367.50
X=367.5/20=18.3=18 days
Julian can enjoy golf 18 days
18 days*$20+$7.50=$367.5 < $375-- ---> is ok
The number of days and the money represent a proportional relationship that can be expressed through the equation of a line
I select two points from the table
Point A(0,7.5)
Point B (2,47.5)
The equation of the line
Y=mx+b
For x=0 y=7.5
Therefore b=7.5
For point B
47.5=m*(2)+7.5------------- >m=(47.5-7.5)/2=20
m=20
y=20x+7.5 see attached graphic