What is the slope of the line?

PLEASE NOW HELP!!!

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.

In a column proof the right column states your reasons

The sum of the abscissa and the ordinate is six