(-3,20) (3,0) (18,20) (13,18) is it a function

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

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

Explain how you do each step what term makes it inconsistent y=2x - 4 ?