positive slope, the line goes up (increases) from left to right
negative slope, the line goes down (decreases) from left to right
zero slope, the line is horizontal (flat)
undefined slope, the line is vertical (straight up)
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Take any two lines and look at their slopes. -- If the slopes are equal, then the lines are parallel. -- If the product of the slopes is -1, then the lines are perpendicular.
Four million thirty looks like this: 4,000,030
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They have four sidesThey have four sides and four angles.Quadrilateral shapes have four sides and four angles.
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