Question

Chris withdraws $7.50 per week from his savings account. After 15 weeks, the balance in the account is $585.


A. Write an equation in point -slope form to model this.




B. Write the equation in slope-intercept form.




C. How much is in the account after 1 year (52 weeks)?


;Details or extra information would be appreciated .

Answer 1

A. Ao = 7.5*15 + 585 = $697.50 = Initial amount.

Y = 697.5 - 7.5x
Y = -7.5x + 697.5.

P1(X1,Y1) = (15,585).

Y-Y1 = m(X-X1). Point-slope form.
Y-585 = -7.5(X-15).

B. Y = mx + b. Slope-intercept form.
Y = -7.5x + 697.5.

C. Y = -7.5*52 + 697.5.