Can y’all help me on question 39?!

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.

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

How is working backward similar to solving an equation?