Answer
The slope of this equation is $ -\frac{1}{2} $, and the y-intercept is $ \frac{2}{3} $.
The graph would shift 3 units down the y axis if the intercept moved down 3 units. However, the graph would not stretch, shrink or flip.
Work Step by Step
The location of the slope and y-intercept is the same for all linear functions in slope intercept form. The coefficient tied to the variable ($ -\frac{1}{2} $ ) is always the slope and the constant $ (\frac{2}{3}) $ is the y-intercept.
A shift in the y-intercept only changes the location of the graph, as the y-intercept simply states where the graph will cross the y-intercept. Thus a 3 unit shift downward will simply shift the entire graph 3 units down on the y-axis.
