The T-shirt launcher can launch 315 shirts per hour.
Jessica runs fastest because her time/second is about 10 seconds while brookes is around 12.
The slope formula is is rise over run or y2-y1/x2-x1
If you plug in those numbers you will get
(-1)-(-4)
———
1-(-2)
Simplify it and you get
3
— or 1
3
So the slope is 1
D+b(3) just put them all together