Refer the figure below and answer the questions that follow.
Which of the linear equations represent the line drawn on the X-Y plane?
5x + 4y = 20
5x + 4y = -20
4x + 5y = 20
4x + 5y = -20
4x + 5y = 20 represents the line drawn; since for x= 0, y = 4; and y = 0, x = 5.
What is the equation of chord of contact of tangents drawn from P(10, 8) to the ellipse x225+y216=1.