Question

You are told that a bank investment can be modeled by a linear equation. The slope of the linear equation is positive and the value for b in the equation is 30,000. What can be said about the initial investment, and is the money increasing or decreasing, based on the information given?

Answer 1

If the investment can be modeled by a linear equation, the slope positive, and the value for the y-intercept is at 30,000, the equation of the line is
y = mx + 30,000
where m > 0

The initial investment is when x is 0 or the y-intercept. Therefore, the initial investment is $30,000

Since the slope of the line is positive, this means that the investment will increase through time.