The linear equation y=kx+4 is in slope-intercept for, and so the slope of the line is k. Since the line contains the point(c, d),the coordinates of this point satisfy the equation y=kx+4;d=kc+4. Solving this equation for the slope k, gives k=
d−4
c
. Choices B, C, and D are incorrect and may be the result of errors in substituting the coordinates of (c, d) in y=kx+4 or of errors in solving for k in the resulting equation.