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How to find the equation of a line.

How to find the equation of a line. Equations of lines start with y =. Equations of lines start with y = Next comes the slope (slopes are fractions). Equations of lines start with y = Next comes the slope (slopes are fractions) Last is the y-intercept.

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How to find the equation of a line.

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  1. How to find the equation of a line.

  2. Equations of lines start with y =

  3. Equations of lines start with y = Next comes the slope (slopes are fractions)

  4. Equations of lines start with y = Next comes the slope (slopes are fractions) Last is the y-intercept. (the point where the line crosses the y-axis)

  5. .B .A Name this line’s equation.

  6. .B .A This line is going uphill so the slope is positive.

  7. .B .A To get from point A to point B, go up 2 and right 2 so this line’s slope is or 1.

  8. This line crosses at (0,2) so the y-intercept is = to 2. .B .A

  9. .B .A This line’s equation is y = slope = 1 and y –int = 2

  10. .B .A y = 1 slope = 1 and y –int = 2

  11. .B .A y = 1x slope = 1 and y –int = 2

  12. .B .A This line’s equation is y = 1x +2 slope = 1 and y –int = 2

  13. Name this line’s equation. .C .D

  14. .C This line is going downhill so the slope is going to be negative. .D

  15. .C To get from point C to point D, go down 6 and right 3 so this line’s slope is or -2. .D

  16. .C This line crosses at (0,4) so the y-intercept is = to 4. .D

  17. .C We have all the parts to name this line. .D

  18. .C y = slope = -2 and y-int = 4 .D

  19. .C y = -2 slope = -2 and y-int = 4 .D

  20. .C y = -2x slope = -2 and y-int = 4 .D

  21. .C The line’s equation is y = -2x + 4 slope = -2 and y-int = 4 .D

  22. Name this line’s equation. . K .J

  23. This line is going uphill so the slope will be positive. . K .J

  24. To get from point J to point K, go up 5 and right 3 so this line’s slope is . . K .J

  25. This line crosses at (0,-4) so the y-intercept is = to -4. . K .J

  26. We have all the parts to name this line. . K .J

  27. . K y = Slope = and y-int = -4 .J

  28. . K y = x Slope = and y-int = -4 .J

  29. The line’s equation is . K y = x - 4 Slope = and y-int = -4 .J

  30. Name this lines equation. . M .L

  31. This line is going uphill so the slope will be positive. . M .L

  32. To get from point L to point M, go up 1 and right 2 so this line’s slope is . . M .L

  33. This line crosses at (0,2) so the y-intercept is = to 2. .M .L

  34. We have all the parts to name this line. . M .L

  35. . M .L y = Slope = and y-int = 2

  36. . M .L y = Slope = and y-int = 2

  37. . M .L y = x Slope = and y-int = 2

  38. The line’s equation is . M .L y = x + 2 Slope = and y-int = 2

  39. Practice Time

  40. Name this line’s equation. .R .Q

  41. Slope = .R .Q

  42. Slope = y- int = -3 .R .Q

  43. The line’s equation is y = x - 3 .R .Q

  44. Name this line’s equation. .S .T

  45. .S Slope = .T

  46. .S Slope = y-int = 2 .T

  47. .S The line’s equation is y = x +2 .T

  48. Name this line’s equation. .U .V

  49. .U Slope = .V

  50. .U Slope = y-int = +5 .V

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