Question

look at this graph: graph of a coordinate plane with a horizontal red line at y = -3 write the equation of the line.

Explanation:

Step1: Identify line type

The graph is a horizontal line, which has the form $y = k$ where $k$ is a constant (the y-intercept).

Step2: Find y-intercept

The line crosses the y-axis at $y = -3$, so $k = -3$.

Answer:

$y = -3$