The answer to the velocity question if anyone needs it! Part A:

The equation in standard form would be 2x+y=22.

Using two points: (4,14) and (9,4) you can solve for the slope 10/-5=-2

Then using y-y1=m(x-x1) (point-slope form) to identify one point on the line.

So for the equation, it would be y-4=-2(x-9) add 2x to both sides of the equation then you would add 4 to both sides.

Then you are left with 2x+y=22

Part B:

To graph the equation for the first 10 hours you would substitute 10 for x because x is the time variable.