Question

How do I find the value of x so the slope of a line through (x,5) and (4,2) is 1/3?

Answer 1

slope=change in y/change in x
1/3 = 5-2/x-4 (or 2-5/4-x)
1/3 = 3/x-4
then cross multiply
1(x-4) = 3(3)
x-4=9
add 4 to both sides
x=13