Question

(05.03 MC)

Lisa reads an equal number of pages of a book every week. The graph below shows the number of pages of the book left to read, y, after x weeks:

A graph titled Lisas Book Reading shows Number of Weeks on the x-axis and Number of Pages Left on the y-axis. The scale on the x-axis shows numbers from 0 to 6 at increments of 1, and the scale on the y-axis shows numbers from 0 to 350 at increments of 50. A straight line joins the ordered pairs 0, 250 and 1, 200 and 2, 150 and 3, 100 and 4, 50 and 5, 0.
Which equation best models the relationship between x and y? (1 point)


y = −50x + 250

y = −5x + 50

y = −50x + 350

y = −5x + 250


Please help!! I am stuck on this question and I don't understand!!!!

Answer 1

Since the graph shows a straight line, it doesn't matter which pair of points we take, so
let's take the first two.
(0, 250) and (1,200).
The (0,250) is very useful since it shows the y-intercept to be 250
so our equation in the form y = mx + b
must be y = mx + 250
All we need is the slope!
slope = (200-250)/(1-0) = -50

so what do you think??

Answer 2

Thank you so much Reiny!!!! Means alot

Answer 3

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