Question

The equation y = 350x + 480 describes the amount of money in Blake’s savings account, where y is the amount of money in his account and x is the number of monthly deposits he makes. Eddie also has a savings account, and the balances in his account are recorded in the table.
How much money did each account start with?

Number of Monthly Deposits 1 2 4 7
Balance ($) 900 1375 2325 3750

Blake’s account started with $
.
Eddie’s account started with $
.

Answer 1

Blake's account started with y = 350*x + 480 which at x = 0 (before the first deposit) is y = 350*0 + 480 = 0 + 480 = $480. 

The equation of the line determine by the points given for Eddie's account is this:

y = 475*x + 425.  At x = 0, y = 475*0 + 425 = $425.

Blake: $480 and Eddie: $425