I'm stuck on this question and i don't wanna mess it up cause i need to get a 100 on this khan academy : (

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

What properties allow transformation to be used as a problem solving tool

How can i differentiate this equation?