Your brother lies down at the ground level and uses a protector to measure the angle of elevation of the wall he finds its at 72° he is lying 12 feet 3 inches away from the rock wall what method is he using to approximate the height of the rock wall? use this method to approximate the height of the rock wall

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14