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Warm-up

Learn how to write equations of lines in different forms, including slope-intercept, point-slope, and standard form. Practice finding equations given slopes, y-intercepts, and points on the line.

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Warm-up

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  1. Warm-up You are driving on a road trip and you want to find out how many hours total it will take you to get to California. After driving for 4 hours, you were 280 miles from home. You are now 520 miles from home and have driven for 8 hours. How long will it take you to drive 3000 miles?

  2. Writing Equations of Lines

  3. 3 Forms Slope-Intercept Point-Slope Standard **Always have the variables x & y**

  4. Break into groups of 4.

  5. Slope Intercept m is the slope of the line b is the y-intercept of the line

  6. Example 1) Write the equation of the line that has a slope of 4, and a y-intercept of -2. 2) Write the equation of the line between the points (2, 4) and (4, 12).

  7. Example 3) Write the equation of the line pictured.

  8. Point-Slope (x1, y1) is a point on the line m is the slope of the line

  9. Examples • Write the equation of the line that passes through the point (4, -2) and has a slope of 6. 5) Write the equation of the line that passes through the points (1, 8) and (-2, 6).

  10. Standard Form Where A, B & C are integers A is NOT negative

  11. Putting Equations into Standard Form 1) Put the equation into slope-intercept form. 2) Subtract mx from both sides (EX: y = 3x + 7 becomes –3x + y = 7) 3) If the number in front of x is negative, multiply everything by -1. 4) If the number in front of x is a fraction, multiply everything by the denominator.

  12. Examples • Write the equation of the line that passes through the points (2, 6) and (3, -3) in standard form. • Write the equation of the line that has slope -5 and passes through the point (1, -4) in standard form. • Write the equation of the line through the points (3, -5) and (7, 1) in standard form.

  13. Pop Quiz • You are given the slope of a line and a point on the line. How can you find an equation of the line? • You are given the slope of a line and the y-intercept of the line, how can you find an equation of the line? • You are given the x-intercept and the y-intercept of a line, how can you find an equation of the line?

  14. WRITE THIS 1) Given slope (m) and y int (b): plug into y = mx + b 2) Given slope (m) and a point (x, y): plug into y = mx + b to find b. Then go to step 1. 3) Given two points (x1,y1) and (x2, y2): First find slope, then go to step 2.

  15. Exit Ticket 9) Write the equation of the line perpendicular to the line y = ½ x + 8 through the point (1, -7) in all 3 forms.

  16. Flipped

  17. Slope Intercept m is the slope of the line b is the y-intercept of the line

  18. Example 1) Write the equation of the line that has a slope of 4, and a y-intercept of -2. 2) Write the equation of the line between the points (2, 4) and (4, 12).

  19. Example 3) Write the equation of the line pictured.

  20. Point-Slope (x1, y1) is a point on the line m is the slope of the line

  21. Examples • Write the equation of the line that passes through the point (4, -2) and has a slope of 6. 5) Write the equation of the line that passes through the points (1, 8) and (-2, 6).

  22. Standard Form Where A, B & C are integers A is NOT negative

  23. Putting Equations into Standard Form 1) Put the equation into slope-intercept form. 2) Subtract mx from both sides (EX: y = 3x + 7 becomes –3x + y = 7) 3) If the number in front of x is negative, multiply everything by -1. 4) If the number in front of x is a fraction, multiply everything by the denominator.

  24. Examples • Write the equation of the line that passes through the points (2, 6) and (3, -3) in standard form. • Write the equation of the line that has slope -5 and passes through the point (1, -4) in standard form. • Write the equation of the line through the points (3, -5) and (7, 1) in standard form.

  25. Pop Quiz • You are given the slope of a line and a point on the line. How can you find an equation of the line? • You are given the slope of a line and the y-intercept of the line, how can you find an equation of the line? • You are given the x-intercept and the y-intercept of a line, how can you find an equation of the line?

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