The slope would be - 1/2 !!
you would number the x and y values of the coordinates.
( -2 , 5 ) ( -6 , 7 )
x1. y1. x2. y2
then do the formula that gives you the slope y2 - y1 / x2 - x1
this gives you:
7 - 5 / -6 - (-2) = 2/ -4 (simplify) -1/2
so this would give you m= -1/2

Let's find the Radius ~






or

I hope you understood the whole procedure, let me know if you have doubts ~
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<em>Total marbles:</em> 8 + 16 + 14 + 10 = 48
<em>Marbles that are not white:</em> 48 - 16 = 32
<em>Probability it will not be white:</em> 32/48 = 2/3