x represents the number of weeks he has been saving.
y is the total money in his account.
The slope is $15
The y intercept is 35
For the table
X:0 and y: 35, x:1 y:50, x:2 y:65, x:3 y:80 x:4 y:95 , x:5 y:110 ,
This table is not proportional because the equation you have has a y intercept and for it to proportional it has to be written as y=mx not as y=Mx+b