Question

lesson 4.1 - introduction to quadratic graphs
y = -1 is the axis of symmetry.
true

Explanation:

Step1: Recall axis of symmetry rule

For a vertical parabola, the axis of symmetry is a vertical line with the form $x = h$, where $h$ is the x-coordinate of the vertex.

Step2: Identify vertex from graph

The vertex (lowest point) of the parabola has an x-coordinate of $-1$, so the axis of symmetry is $x = -1$.

Step3: Compare with given statement

The given statement claims the axis is $y=-1$, a horizontal line, which does not match the correct vertical axis of symmetry.

Answer:

False (the statement "y = -1 is the axis of symmetry" is incorrect)