Two lines are if their are identical. Thus, we should find the slopes of the lines using the .
If we start with line we identify two points on the line.
Note that when choosing points to substitute for
it doesn't matter which points on the line you choose, since the result will be the same. Now, we substitute the points into the slope formula.
The slope of line
We will use the same method to identify the slopes of lines
The points are now used in the slope formula.
Now that we've identified the slope of each line, we can see that and have the same slope, so they are parallel.