The two real roots of this equation are equal, which is the abscissa of point P. From the relationship between root and coefficient, we can know that the abscissa of point P is: 1/2×(-8km/m? ) =-4k/m, and then substitute x=-4k/m into y=kx+m to get:

Y=-4k？ /m+m=(-4k？ +m？ ) /m = 3/m, (Note here -4k? +m？ =3),

∴P(-4k/m,3/m), while∵ q is on the straight line x=4, and the abscissa of∴ q is 4. Substitute x=4 into the linear equation y=kx+m, and you get y=4k+m, ∴Q(4,4k+m).

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