I need help with all of these question immediately, I will mark you as brainlist and full extra 50 points given if you solve this

How to determine whether two known pairs of points are on the same line.

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

Which graph has a rate of change of zero