Find y if the line through (5, 3) and (7, y) has a slope of 6.

Question

I've been told the answer is 15 but I just cant seem to come up with the same answer. Could I get some help walking through this problem please?

Find y if the line through (5, 3) and (7, y) has a slope of 6.

Answer 1

(y-3)/(7-5) = (y-3)/2 = 6 slope = "rise over run" or change in y coordinates over change in x coordinates

then cross multiply

y-3 = 12, then add 3 to both sides

y = 12+3 = 15