two things could happen...you could answer the questions or help me understand Slope.. Both would be find but the second one would be wonderful

Slope is rise over run.  To calculate rise over run you go from a point to the next. In your case, the rise over run is 1000/1. So your rate of change is 1000. Your y-intercept form equation is y=1000x+0, because 0 is the y-intercept.

0x1000+0=0

1x1000+0=1000

2x1000+0=2000.

3x1000+0=3000

So, if it's asking what time the balloon is at 5000 ft, you do 5000/1000=5. (you'd divide by your rate of change because division is opposite of multiplication). So, at 5 minutes, the balloon will be at 5000 ft.

Since 2 seconds is 1/30 of a minute, you do 1/30 to get .03. .03x1000+0= 30.

This means the balloon will be 30 feet in the air at 2 seconds.

The balloon will reach 10,000 ft at 10 minutes. You take the feet and divide by the slope. 10,000/1000 = 10 and 10x1000+0=10,000