Answer:
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
