Determine whether the slope of each line is positive or negative.

Determine whether the slope of each line is positive or negative.

Determine whether the slope of each line is positive or negative.

The hot air balloon climbs at a rate of 400 feet per minute.
The hot air balloon drops at a rate of 300 feet per minute.
Jada received a $15 gift card to an online music store. Every time she buys a song, $1.50 is subtracted from the amount available on her gift card.

Write an equation that represents the amount of money on the gift card, y, after x songs are purchased.
Kelly is starting out on a road trip with her friends. Her car has 15 gallons of gas in the tank and can travel 100 miles using 4 gallons of gas.
The initial amount of gas in the tank is 15 gallons.
Kelly is starting out on a road trip with her friends. Her car has 15 gallons of gas in the tank and can travel 100 miles using 4 gallons of gas.
The car can travel 50 miles with one gallon of gas.
Kelly is starting out on a road trip with her friends. Her car has 15 gallons of gas in the tank and can travel 100 miles using 4 gallons of gas.
After traveling for 150 miles, the car has 10 gallons of gas in the tank.
-3x + (-2) = -17