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Wednesday, March 1 st

Wednesday, March 1 st. Warm Up. Please have Graphing and tables worksheet out! . Explain how you graph the point (-5, 9) 2. What quadrant does the point (-11, -9) fall in ?. Corny of Joke of the Day. What did the bee say to the flower? Hello honey!. Homework Answers.

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Wednesday, March 1 st

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  1. Wednesday, March 1st Warm Up Please have Graphing and tables worksheet out! Explain how you graph the point (-5, 9) 2. What quadrant does the point (-11, -9) fall in?

  2. Corny of Joke of the Day What did the bee say to the flower? Hello honey!

  3. Homework Answers

  4. Where is the origin?!?!

  5. Do You Remember? • Which axis is the horizontal axis? _____________ • Which axis is the vertical axis? _____________

  6. Label the Quadrants!

  7. Goal for Today Equations to Tables to Graphs

  8. Part I: Equation to table to graph

  9. Steps • Make an input/output table for the equation, with the given x values. • x values on the left and y values on the right • Graph the equation on the coordinate plane by using (x,y)

  10. Example #1 Y = 2x for x=1,2,3,4

  11. Example #2 Y=x÷2 for x=4, 6, 8, 10

  12. Example #3 Y=3x-7 for x=4,5,6,7

  13. Part II: Checking an Ordered Pair

  14. Steps • Substitute x and y into the equation • Perform operations to see if both sides of the equations are equal

  15. Just Watch Is ( 3 , 8 ) a solution forthe equation 8=5(3)-7 8=15-7 8=8 CORRECT!

  16. You Try! • ( 10 , 5 ) for • ( 1.3 , 3.9 ) for • ( 12 , 3 ) for • ( 27 , 9 ) for • ( 4 , 11 ) for

  17. Part II: Intro to Direct Variation

  18. Direct Variation

  19. The Basics • The direct variation equation is y = kx • Two quantities are in direct proportion if the proportions between them never changes. • No matter how one quantity changes, the other quantity changes in the same direction and at the same rate. Example: If the x value increases then the y value increases • K is the constant of proportionality. (Slope) k=y/x • When you graph a direct variation equation is always goes through point (__0_,_0__), the origin.

  20. Identifying k Give the value shown for k • Y = 4x • Y=1/2x • Y=.75x • Y=x 4 1/2 .75 1

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