The equation was found with the equation y = a l x-h l + k. First, we replaced the values of h and k with the points of the vertex, knowing that h is the x coordinate of the vertex and k is the y coordinate. Our vertex was ( 3, 4 ). Then we replaced x and y with an extra point that is     ( 2.4, 2). Finally, we isolated a and then replaced the equation knowing a, h, and k.