The histogram shows the scores of students on their most recent history test. How many students scored 80% or better on the test?
PLZ HELP

the slope of the first function is -3. (3/1)

the slope of the second function is 1. (13-10/6-3).

since |-3| is greater than |1|, the function with the steepest slope is the first.

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative