A parabola with a vertex at (0,0) has a focus along the negative part of the x-axis.

Which could be the equation of the parabola?

y2 = x

y2 = - 2x

x2 = 4y

x2 = - 6y

All of them have vertices on (0,0)

for the focus to be on negative part of x axis, make sure that it opens left

so it has to be the y term that is squared

so it is the 1st or 2nd

the first one will give us a parbola opening right

2nd will give us onpening left

answer is y^2=-2x

Y2=x is my choice of answer