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# Alg2 lesson 2.3

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• 1.
• 2.
• 3.
• 4. Slope
m = vertical change Horizontal change
m = ΔyΔx
m = rise run
Any two points on a line can be used to determine its slope.
• 5. Find the slope of a line passing through (-3,5) & (2,1)
• 6. Classification of lines by slope
Positive slope
Zero slope
Negative slope
Undefined slope
• 7. Graph x = 1
Graph y = 3
• 8. Parallel lines have equal slopes.
Perpendicular lines have slopes that are opposite reciprocals.
• 9. Graph the line that passes through (2, 1) that is parallel to the graph of 4x – 2y = 10
4x – 2y =10
-2y = -4x + 10 -2 -2 -2
y = 2x – 5
m = 2 , b = -5
Parallel slope = 2
• 10. Graph the line that passes through (2, 1) that is perpendicular to the graph of 4x – 2y = 10
4x – 2y =10
-2y = -4x + 10 -2 -2 -2
y = 2x – 5
m = 2 , b = -5
Perpendicular slope = -1/2