If two parallel edges meet are they counted as one or two edges

Which of the following points is collinear with (-2,1) and (0,3)

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15