the formula for finding slope when given two points on the line is
m=(y-y)/(x-x)
it doesn't really matter which x and y you use first but it needs to be consistent.
so if you use 62 as the first y, you must use 6 as the first x.
so using 62 as the first y you can do
m=(62-53)/(6-5)
m= 9/1
m=1
now that we have the slope we can being to assemble the formula
slope intercept form is y=mx+b when m=slope and b= y-intercept
now the equation will be
y=9x+b
since you are missing the y-intercept, you can plug in one of your coordinates that you do have for x and y and then solve for b
53=9(5) + b
53=45 + b
8=b
now that you have b you can finish the equation
y=9x+8
