(50 points to answer 3 questions)

harry reads equal numbers of pages of a book every week. the graph shows the number of pages of the book left to read, y, after x weeks: (graph at the bottom)

which equation best models the relationship between x and y?

y = −5x + 55
y = −55x + 385
y = −5x + 275
y = −55x + 275

what is the initial value of the function represented by this graph?

a coordinate grid is shown with x- and y-axes labeled from 0 to 7 at increments of 1. a straight line joins the ordered pair 0, 5 with the ordered pair 7, 7. (graph at the bottom)

0
4
5
7

mike is cycling from the library to his home. the equation shows mike's distance (y), in miles, from his home after x minutes:

y = 12 − 2x

what does the number 12 in the equation represent?

the speed at which mike is cycling
the rate of change of mike's speed
mike's distance from home when he begins cycling
mike's distance from the library when he begins cycling