12. Determine the x intercept of the plane 4x + y − 3z + 12 = 0.

Is the point (3,0) on the x-axis or y-axis? How do you know?

Find the equation of the line perpendicular to the line y=3 and passing through the midpoint of the segment joining 2, 4 and -6, 10.

The point that is 2 units to the left of the y-axis and 4 units above the x-axis has coordinates (______ , ________ ).