A paper airplane was thrown from the top of a tall building. The height of the paper airplane above the ground can be found using the function `y=-1.5x+60` , where `x` is the time in seconds the airplane has been in the air. Jayden made this table to figure out how high the plane was at different times.
0 | 60
10 | 45
20 | 30
30 | 15
40 | 0

How would the equation `y=-1.5x+60` change if the height at 0 seconds was 75?