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anonymous

  • one year ago

Write the standard form of the equation of the line described. #1) through: (-5,3), perpendicular to y=5/7x+4.

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  1. anonymous
    • one year ago
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    do you know what the slope of \[\huge y=\color{red}{\frac{5}{7}}x+4\] is ?

  2. anonymous
    • one year ago
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    5/7

  3. anonymous
    • one year ago
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    ok good so the perpendicular line will have slope ?

  4. anonymous
    • one year ago
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    5/7

  5. anonymous
    • one year ago
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    no, that would be the slope of any parallel line you are asked for a perpendicular line

  6. anonymous
    • one year ago
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    what would it be?

  7. anonymous
    • one year ago
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    in english (math english) it is the "negative reciprocal" i.e. flip it and change the sign

  8. anonymous
    • one year ago
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    -7/5

  9. anonymous
    • one year ago
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    right

  10. anonymous
    • one year ago
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    now use the point slope formula to find the equation, since you have a point and the slope

  11. anonymous
    • one year ago
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    y=-7/5x-5, is this the correct answer?

  12. anonymous
    • one year ago
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    i doubt it, since it has all those fractions

  13. anonymous
    • one year ago
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    \[y-3=-\frac{7}{5}(x+5)\] is a start

  14. anonymous
    • one year ago
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    multiply out and get \[y-3=-\frac{7}{5}x-7\] oh look the fractions are gone, but now you add \(3\) to both sides

  15. anonymous
    • one year ago
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    y=-7/5x-4

  16. anonymous
    • one year ago
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    looks good to me

  17. anonymous
    • one year ago
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    My textbook said the answer would be 7x+5y=-20

  18. anonymous
    • one year ago
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    that is because your text had you answer in standard from rather than point slope form

  19. triciaal
    • one year ago
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    the question asked for standard form

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