Since the lines are parallel and you know the slope of 
is -2, you know the slope of line 
will also be -2. You can see on the coordinate grid that line crosses the y-axis at -1. When you piece all of these facts together into slope-intercept form you get = -2x - 1.
Suppose we lined up all the people in the world (about 6.7 billion people). Assume that each person occupied 12 inches of the li
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