Question

what is the equation for axis of symmetry? y = 3 x = 3 x = 1 x = 5

Explanation:

Step1: Recall axis - symmetry concept

For a parabola, the axis of symmetry is a vertical line of the form $x = h$, where $(h,k)$ is the vertex of the parabola.

Step2: Identify vertex from graph

By observing the graph, the vertex of the parabola has an $x$ - coordinate of $3$. So the equation of the axis of symmetry is $x = 3$.

Answer:

$x = 3$