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Lines. y. 6. 4. 2. x. O. –6. –4. –2. 2. 4. 6. y. y. y. y. y. –2. 6. 6. 6. 6. 6. –4. 4. 4. 4. 4. 4. –6. 2. 2. 2. 2. 2. x. x. x. x. x. O. O. O. O. O. –6. –6. –6. –6. –6. –4. –4. –4. –4. –4. –2. –2. –2. –2. –2. 2. 2. 2. 2. 2. 4. 4. 4.
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Lines y 6 4 2 x O –6 –4 –2 2 4 6 y y y y y –2 6 6 6 6 6 –4 4 4 4 4 4 –6 2 2 2 2 2 x x x x x O O O O O –6 –6 –6 –6 –6 –4 –4 –4 –4 –4 –2 –2 –2 –2 –2 2 2 2 2 2 4 4 4 4 4 6 6 6 6 6 –2 –2 –2 –2 –2 –4 –4 –4 –4 –4 –6 –6 –6 –6 –6 How do you graph the line and find its equation when 1. You are given the y-intercept and the slope. Example: y-intercept is 1 and slope is 2/3. Equation: 2. You are given a point and the slope. Example: point is (–2, 3) and slope is –3. Equation: 3. You are given two points. Example: 1st point is (3, –4) and 2nd point is (2, 1). Equation: // Lines and Lines: 1st: Sketch y = ¾x + 1 2nd: Sketch the line parallel to it, and have y-intercept = –2. Q: What is the slope? Q: What is the equation? 3rd: Sketch the line perpendicular to it and have y-intercept = 4. Q: What is the slope? Q: What is the equation? Slope-Intercept Form: where m is the slope and b is the y-intercept Example: y = x – 3 Point-Slope Form: where (x1, y1) is the point and m is the slope Example: y – 1 = 2(x – 2) General Form: Example: 4x – 3y = 12 Two-Intercepts Form: where a is the x-intercept and b is the y-intercept Example:
