Helen writes a linear equation to model the amount she still owes her aunt over time. Which of the following equations did Helen create to calculate the amount she still owes me loan? Hint: This linear model will also be the equation for the line on the graph o the previous page, and its variables represent A = the amount of money owed at the end of m months m - the number of months a. A = 13,000 - 100m b. A = 13,000 - 10m CA - 13,000 -%m d. A = 13,000-130m 8. Which of the following statements correctly describes the vertical intercept in the graph above? a. The vertical intercept is the monthly payment. b. The vertical intercept is the original loan amount. ic. The vertical intercept is the number of months it takes to pay off the loan. d. There is no vertical intercept