A certain parabola opens to the left, has an axis of symmetry along the x-axis, a vertex at the origin, and a distance between the focus and directrix of 5 units. Which of the following equations models this parabola?
x=-10y^(2)
x=-(1)/(10)y^(2)
y=-10x^(2)
x=-(2)/(5)y^(2)
