Here's the question you clicked on:
smartboy23
Maria has a box of 2 cookies. she gives 2 cookies to each friend. which expression shows the number of cookies Maria has left after giving cookies to m friends? A: 2m-20 B: 20-2m C: 20m-2 D: 20+m
Do you mean she has a box of 20 cookies
Your question probably meant to read a "box of 20 cookies" not 2. She is LESS 2 cookies for each friend, so the slope is a negative 2 and the intercept is 20 because she started with that many. So, 20 - 2m after "m" friends is the # of cookies left.
I am guessing that was a typo and you meant that she had a box of 20 cookies. You said she gave 2 cookies to each friend, then that means that 2m, where m is the number of friends is the number of cookies that she gives away in total. So, to know how many she has left, you subtract 2m from the cookies she had in first place (20). Therefore, the expression would look like this: \[20-2m\] That is choice B.