Answer
All these lines have the same slope.
The graph is attached below:
Work Step by Step
The family of lines to graphed is $y=-2x+b$, where $b=0$ $,$ $\pm1$ $,$ $\pm3$ $,$ $\pm6$
From the graph (attached below), it can be seen that all these lines are parallel, which means the all have the same slope.
