3) mary is going over her account statement. she notices that bank of helix has provided her with the
equation y - 400 = - 75(x-6).
a) list two things that you know about mary's account. how do you know these things?

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.