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Do Now 5/20/10

Do Now 5/20/10. Take out HW from last night. Text p. 388, #8-22 evens and #19 Copy HW in your planner. Text p. 394, #12-23 all (8 graphs) In your notebook, tell whether each table is a function or not a function. Each input must be paired with only ONE output. Not a function.

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Do Now 5/20/10

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  1. Do Now 5/20/10 • Take out HW from last night. • Text p. 388, #8-22 evens and #19 • Copy HW in your planner. • Text p. 394, #12-23 all (8 graphs) • In your notebook, tell whether each table is a function or not a function. Each input must be paired with only ONE output Not a function Not a function Function

  2. 8) domain: -2, -1, 0, 1; range: -9, 2, 4, 5 10) domain: -4, -3, 2, 4; range: -1, 0 12) sometimes 14) function 16) relation, -10 has 2 outputs 18) no 19) yes 20) no 22) a). yes, the graph passes the vertical line test b). advisories 20-30 HomeworkText p. 388, #8-22 evens and #19

  3. Objective • SWBAT find solutions of equations in two variables

  4. Section 8.2 “Linear Equations in Two Variables” An example of an equation in two variables is 2x – y = 5. The solution of an equation in two variables, x and y, is an ordered pair(x, y) that produces a true statement when substituted into the equation.

  5. Solving Linear Equations • To find a SOLUTION, substitute the ordered pair into the equation and see if it produces a true statement. 2x – y = 5 Tell whether the ordered pair is a solution to the equation. ordered pair equation substitution check (1, 3) 2x - y = 5 2(1) – 3 = 5 -1 = 5 NO (2,-1) 2x - y = 5 2(2) – -1 = 5 5 = 5 YES

  6. an equation whose graph is a line Linear Equation- y = 4 – 2x

  7. Graph an Equation Graph the equation y = 4 – 2x. y-axis 10 (-2,8) 8 (-1,6) 6 -2 8 4 (0,4) -1 6 (1,2) 2 0 4 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 x-axis (2,0) 1 2 -2 -4 2 0 -6 -8 Is this a function? -10 Yes, it passes the vertical line test

  8. Graph an Equation Graph the equation y = 3x - 4 y-axis 10 8 6 4 -2 -10 (2,2) 2 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 -1 -7 x-axis -2 (1,-1) 0 -4 (0,-4) -4 1 -1 -6 2 2 (-1,-7) -8 -10 (-2,-10)

  9. Graph an Equation Graph the equation y = 2. HORIZONTAL LINE y = b STEP2 STEP3 STEP1 Solve the equation for y. Make a table by choosing a few values for x and then finding values for y. Plot the points. Notice the points appear on a line. Connect the points drawing a line through them.

  10. Graph an Equation Graph the equation x = -1. VERTICAL LINE x = a STEP2 STEP3 STEP1 Solve the equation for x. Make a table by choosing a few values for x and then finding values for y. Plot the points. Notice the points appear on a line. Connect the points drawing a line through them.

  11. Homework Text p. 394, #12-23 all

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