$\"\"$

Observe the graph;

The line is passing through (0, -4) and it is the line is parallel to x-axis.

So, slope of the line is zero. $\"\"$

The equation in slope-intercept form is $\"\"$ , Where m is slope, b is the y-intercept.

Find the y-intercept (b).

$\"\"$ (Substitute 0 for m)

$\"\"$ (Substitute 0, -4 for x, y)

$\"\"$ (Multilpy: $\"\"$ )

$\"\"$ (Apply Additive identity property: $\"\"$ ) $\"\"$

Substitute 0 for m and $\"\"$ for b in the Slope-intercept form equation

$\"\"$ $\"\"$

The line equation in slope-intercept form is $\"\"$ .