To find the slope of a line you must have two points and then you must plug in the two points into the slope formula. The slope formula is m= y2y1 over x2x1. If the slope is a fraction be sure to reduce to the lowest. Remember if a number is divided into zero it is zero, if zero is divided into the number it is undefined. A calculator can help one remember this. Horizontal lines have slopes and vertical lines do not. Drawing the lines on a graph can help you see the actual slopes and which way the line is going.
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