What is a Proportionality?

What could explain what happened when the time was equal to 120 minutes

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!