hitunglah mpq bila p(-6,8) dan q(4,-7)

p = ( -6 , 8 ) q = ( 4 , -7 )
x1 = -6
y1 = 8
x2 = 4
y2 = -7

mpq = y2 - y1 / x2 -x1
        = -7 - 8 / 4 - ( -6 )
        = -15 / 10
        = - 1  1/2

-7-8/4--6=-3/2 jdi mpq=-3/2