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Steph_Rawr352 Group Title

Check my answer? Write the equation of the line passing through point (2,-3) and is perpendicular to y=4x+7 in standard form. I got 4x+y=-11; is it right?

  • one year ago
  • one year ago

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  1. hartnn Group Title
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    no again...

    • one year ago
  2. hartnn Group Title
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    slope of given line ?

    • one year ago
  3. Steph_Rawr352 Group Title
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    4

    • one year ago
  4. hartnn Group Title
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    yes, so slope of perpendicular line ?

    • one year ago
  5. Steph_Rawr352 Group Title
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    4/1 ?

    • one year ago
  6. hartnn Group Title
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    the product of slope of perpendicular lines = -1

    • one year ago
  7. hartnn Group Title
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    so m1 * m2 = -1 m1 = 4, m2= ?

    • one year ago
  8. Steph_Rawr352 Group Title
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    oh 4!

    • one year ago
  9. Steph_Rawr352 Group Title
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    -4 my bad

    • one year ago
  10. hartnn Group Title
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    no, slope of perpendicular line will be negative *reciprocal*

    • one year ago
  11. hartnn Group Title
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    so m1*m2 = -1 4m2=-1 m2 = -1/4 ok ?

    • one year ago
  12. Steph_Rawr352 Group Title
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    ohk sorry I'm not really good at this I just learned this

    • one year ago
  13. hartnn Group Title
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    so now u have slope of required line and a point on it, which equation will u use ?

    • one year ago
  14. Steph_Rawr352 Group Title
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    point-slope form? y-y1=m(x-x1)

    • one year ago
  15. hartnn Group Title
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    thats correct! so what u get ?

    • one year ago
  16. Steph_Rawr352 Group Title
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    y-(-3)=-1/4(x-2) ?

    • one year ago
  17. hartnn Group Title
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    correct :) now simplify....

    • one year ago
  18. Steph_Rawr352 Group Title
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    y-(-3)=-1/4x - idk/: 0.5?

    • one year ago
  19. hartnn Group Title
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    (-1/4)(-2) = +2/4 = +0.5

    • one year ago
  20. hartnn Group Title
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    y-(-3) = y+3

    • one year ago
  21. Steph_Rawr352 Group Title
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    oh wait.. y+3 = -1/4x - 0.5 then would you add -1/4x to the left side? since I have to write it in standard form? ax+by=c?

    • one year ago
  22. hartnn Group Title
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    1) its y+3 = -1/4x + 0.5 2) yes., add 1/4 x , not -1/4 x

    • one year ago
  23. Steph_Rawr352 Group Title
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    ohk so .. 1/4x+y+3=0.5 then add subtract 3 on both sides?

    • one year ago
  24. hartnn Group Title
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    yes, correct

    • one year ago
  25. Steph_Rawr352 Group Title
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    1/4x+y=2.5

    • one year ago
  26. hartnn Group Title
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    0.5-3 = -2.5

    • one year ago
  27. hartnn Group Title
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    or u could first multiply by 4 on both sides

    • one year ago
  28. Steph_Rawr352 Group Title
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    oh yeah.. sorry.. and oh ohk if i did that it would be x+y=2

    • one year ago
  29. hartnn Group Title
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    let me show you steps: y+3 = -1/4x + 0.5 y+1/4 x +3= 0.5 multiplying 4 on both sides 4y+ x + 12 = 2 now can u solve ahead

    • one year ago
  30. Steph_Rawr352 Group Title
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    4y+x=14

    • one year ago
  31. hartnn Group Title
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    2-12=?

    • one year ago
  32. Steph_Rawr352 Group Title
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    oh whoops -10

    • one year ago
  33. hartnn Group Title
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    you will subtract 12 from both sides, right ?

    • one year ago
  34. Steph_Rawr352 Group Title
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    yes, sorry

    • one year ago
  35. hartnn Group Title
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    so finally, 4y+x=-10

    • one year ago
  36. Steph_Rawr352 Group Title
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    yeah thank you though! (:

    • one year ago
  37. hartnn Group Title
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    welcome ^_^

    • one year ago
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