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Warm up

Tell whether the relation is a function. {(-1, 5), (-3, 2), (2, 0), (1, 2)} Evaluate: f(x) = 2x 2 – 4 when x = -3 Find the slope: (5, -1) and (7, -1) Tell whether the lines are parallel, perpendicular, or neither. Line 1 : (-1, 6) and (2, 8) Line 2 : (3, 2) and (1, 5). Warm up.

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Warm up

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  1. Tell whether the relation is a function. {(-1, 5), (-3, 2), (2, 0), (1, 2)} Evaluate: f(x) = 2x2 – 4 when x = -3 Find the slope: (5, -1) and (7, -1) Tell whether the lines are parallel, perpendicular, or neither. Line 1: (-1, 6) and (2, 8) Line 2: (3, 2) and (1, 5) Warm up

  2. Review Quiz

  3. Writing Equations of Lines

  4. How can you find an equation of a line given: The slope and the y intercept of the line? The graph? Essential Questions

  5. I. How to Write an Equation of a LineGiven m and b 1. Write down y = mx + b 2. Substituteslope for m and y-intercept for b. 3. Simplify the equation

  6. Write the equation of the line given m and b. Ex. 1 Slope is -5 and y-intercept is 2 y = -5x + 2 Ex. 2 Slope is -1/2 and y-intercept is -2 y = -½x – 2

  7. Write the equation of the line given m and b. Ex. 3 Slope is 0 and y-intercept is 3 y = 3 Ex. 4 Slope is 1/3 and y-intercept is 0

  8. II. How to Write an Equation of a Line Given a Graph Write down y = mx + b Use any 2 “good” points on the graph to find the slope, m. Find the y-intercept on the graph, b. Substituteslope for m and y-int for b into the equation y = mx + b.

  9. 5. Write the equation of this graph  

  10. 6. Write the equation of this graph  

  11. 7. Write the equation of this graph   y = -3x + 2

  12. 8. Write the equation of this graph   y = 2x

  13. 9. Write the equation of this graph   y = 3

  14. 10. Write the equation of this graph x = - 6

  15. 11. & 12. Write the equation of each graph     y = 2x – 3 y = -3/2x + 3

  16. Classwork Worksheet

  17. Homework Worksheet

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