What is the exact equation? You posted thrice (which by the way is not according to the rules of the site) and none of them are the same things!
I assume that the first one was the good one.
Well, in any linear equation in the form Y = mX +c, the slope is given by m. What you need to do therefore is to make y the subject of formula and see what is the coefficient (the number in front) of x.
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