12 points answer fast ez question

do question number 2

When only separate discreet points are graphed it is called?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest