Find an equation of the tangent line to the graph at the given point. Vx + Vy = 5, (4, 9) Use a graphing utility to graph the equation and the tangent line in the same viewing window. 25 y 25 25 25 20 20 20 20 15 15 15 15 10 10 10 10 5 5 5 5 X O 0 5 10 15 20 25 5 X 10 15 0 20 25 O 0 5 10 15 20 25 O 0 5 DETAILS LARCALC11 2.6.007