Quantitative Algebra (5/6)

A man is climbing down from 100 feet high descending 30 feet per minute.

An airplane 30,000 feet above the ground begins descending at a rate of 2,000 feet per minute. Write an equation to model the situation.

Suppose that a bike rents for $4 plus $1.50 per hour. Write an equation in slope-intercept form that models this situation.

In order to join an online learning community, there is a $20 startup fee and a $5 monthly fee. Write an equation in slope-intercept form that models this situation.

Solve the system.

How many solutions will this system have? (Hint: There is a pink line and a blue line, one on top of the other.)

What is the solution to the system?

What is the solution to the system?