Answer
determine which is the squared variable in the equation
if $x$ is squared $\Rightarrow$ vertical axis
if $y$ is squared $\Rightarrow$ horizontal axis
Work Step by Step
Given an equation of a parabola, determine if $x$ or $y$ is the squared variable. If $x$ is the squared variable, then the parabola has a vertical axis. If $y$ is the squared variable in the equation, then the axis is horizontal.
