Question

Equation 2 should represent a parabola that opens down and has a negative y- intercept.

Answer 1

The general equation of a parabola is
`y^2=4ax` which represents parabola opening along the positive x-axis and vertex at the origin.

Second equation of the parabola is
`y^2 = -4ax` which represents parabola opening in negative x-axis and vertex at origin.

3rd Equation of parabola is
`x^2 = 4ay` which represents parabola opening along the positive y-axis and vertex at the origin.

4th equation of the parabola is
`x^2 =- 4ay` which represents parabola opening along negative y-axis and vertex at the origin.

Hence, the 4th equation represents Equation 2 which is
`x^2 =- 4ay`, and parabola opens down and has a negative y-intercept.