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Unit 3, Lesson 2 Textbook Section 4.5

Unit 3, Lesson 2 Textbook Section 4.5. October 9, 2009. Graphing Linear Equations . USING THE X AND Y INTERCEPTS. When we know that a function is linear, we can use just 2 points to graph a line: X intercept – the point where the line crosses the x-axis

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Unit 3, Lesson 2 Textbook Section 4.5

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  1. Unit 3, Lesson 2Textbook Section 4.5 October 9, 2009

  2. Graphing Linear Equations USING THE X AND Y INTERCEPTS When we know that a function is linear, we can use just 2 points to graph a line: X intercept – the point where the line crosses the x-axis Y intercept – the point where the line crosses the y-axis Where y = 0 Where x = 0 In this example, what is the X intercept… Y intercept…

  3. Find the Intercepts in a graph

  4. More if needed…Find and intercept in a graph

  5. Sometimes we get the intercepts in a table. Find the intercepts below…

  6. TRY THESE.Find the intercepts in a table… 1. 2.

  7. Find the intercepts from a linear equation. Find the intercepts then graph the equation. EXAMPLE: 3x + 2y = 9 TO FIND THE INTERCEPTS SET X = 0 AND SOLVE FOR Y. THEN SET Y = 0 AND SOLVE FOR X.

  8. EXAMPLE 2: FIND THE INTERCEPTS AND GRAPH. 2X - 5Y = -10 SET X = 0 AND SOLVE FOR Y. THEN SET Y = 0 AND SOLVE FOR X.

  9. EXAMPLE 2: FIND THE INTERCEPTS AND GRAPH. Y = 2 SET X = 0 AND SOLVE FOR Y. THEN SET Y = 0 AND SOLVE FOR X.

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