book Maths Puzzle Numerical Ability

Find the slope, if it exists, of the line containing the pair of points (4,-8) , and (-7,-8)

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book Other Question

A circle with radius 10 and center (h,6) passes through the points (8,-2). Find the possible values of h.
a. 2 or 8
b. 2 or -6
c. -6 or 14
d. 2 or 14

I need your help ....(There are Two) How could I create a slope-intercept form if I am given this information: x int = 3, y int = 2. The only equation I could find to use was y-2 = m(x-3). Is this the correct form to use?