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(10,-1)=(-10,-1)
(10,-1) --> (x2,y2)
y-y1/y2-y1 = x-x1/x2-x1
y-7/(-1)-7 = x-(-4)/10-(-4)
y-7/(-8) = x+4/14
14.(y-7) = (-8).(x+4)
14y-98 = -8x-32
14y = -8x-32+98
14y = -8x+66 (bagi 2 kedua ruas)
7y = -4x+33
4x+7y = 33
4x+7y-33 = 0