Are 2/5 4/10 6/15 and 8/20 proportional?

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 is (28 + 7 + 6 + 3) x 1/2 show your work

Pls yall i really need the answer fr fr