1. Find an equation for the parabola, that has its vertex at the origin and directrix {image} Choose the correct answer from the following.
y 2 = 2x
y 2 = 4x
8y 2 = x
y 2 = 8x 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. Find an equation for the parabola, that has a focal diameter 20 and the focus on the negative y-axes. Choose the correct answer from the following.
x 2 = - 20y
x 2 = 20y
x 2 = - 5y
y 2 = 5x 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50