Pre-Calculus

What are the vertices and co vertices of the ellipse x^2/4 + y^2/25=1
I actually have no idea how to even start to solve this problem, so any help will be appreciated.
Steps on how this problem is solved are also appreciated.

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  1. the vertices are at the ends of the major axis, and the covertices are on the minor axis. So, since 25 > 4, the vertices are on the y-axis.

    when x=0, y=5
    when y=0, x=2

    So, the vertices are at (0,±5)
    the covertices are at (±2,0)

    Looks like you need to review the section where this was explained. With graphs, I'm sure.

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