volume of cylinder = pi * radius^2 * height volume of cone = (1/3) * pi * radius^2 * height
now, we know that the two volumes are equal: pi * rcyl^2 * hcyl = (1/3) * pi * rcon^2 * hcon the pi will cross out from both sides. Now, we substitute: x^2 * y = (1/3) * (3x)^2 * hcon x^2 * y = (1/3) * 9x^2 * hcon the x^2 will cross out from both sides and (1/3)(9)=3 y = 3hcon hcon = y/3
