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anonymous

  • one year ago

Identifying parallel and perpendicular lines from coordinates...Help!

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  1. anonymous
    • one year ago
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    This is the one...

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  2. anonymous
    • one year ago
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    @Luigi0210

  3. anonymous
    • one year ago
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    Do you know how to use this equation to find the slope of a line?\[m=\frac{ y_2-y_1 }{ x_2-x_1 }\]

  4. anonymous
    • one year ago
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    yes

  5. anonymous
    • one year ago
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    great. you want to start by using that equation to get the slopes of the three lines

  6. anonymous
    • one year ago
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    0/3 for the first one

  7. anonymous
    • one year ago
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    I got m = (8 - 2) /(-3 - 0) = 6/(-3) = -2

  8. anonymous
    • one year ago
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    Its confusing

  9. anonymous
    • one year ago
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    you have to enter the points into the equation|dw:1444407766451:dw|

  10. anonymous
    • one year ago
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    oooohh i was doing something else but I understand now

  11. anonymous
    • one year ago
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    then that reduces to \[m=\frac{ -6 }{ 3 }\] \[m=-2\]

  12. anonymous
    • one year ago
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    yeah so the first one is -2

  13. anonymous
    • one year ago
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    yep. try the 2nd one

  14. anonymous
    • one year ago
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    8/-4

  15. anonymous
    • one year ago
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    yes and what does that reduce to?

  16. anonymous
    • one year ago
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    2/1

  17. anonymous
    • one year ago
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    -2 actually

  18. anonymous
    • one year ago
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    now the third

  19. anonymous
    • one year ago
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    ok 8/4 = 2

  20. anonymous
    • one year ago
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    yep. ok so the three slopes are line 1 = -2 line 2 = -2 line 3 = 2

  21. anonymous
    • one year ago
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    for part b. parallel lines have the same slope, so lines 1 and 2 are parallel perpendicular lines have opposite reciprocal slopes. (like if one line has slope of 2, then the other must have slope of -½.) None of them are like that, so none of the lines are perpendicular

  22. anonymous
    • one year ago
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    ok

  23. anonymous
    • one year ago
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    @peachpi what about 6/9 , 2/-3 , 3/2

  24. anonymous
    • one year ago
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    where did those numbers come from?

  25. anonymous
    • one year ago
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    I did this one

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  26. anonymous
    • one year ago
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    @peachpi

  27. anonymous
    • one year ago
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    ok. reduce the first one to 2/3. for the 2nd one, once you're done with the math move the negative sign out front, so it's -2/3. None of them are the same, so none are parallel. 2/3 and -3/2 have different signs, and are reciprocals (aka flipped over). so the lines with those two slope are perpendicular

  28. anonymous
    • one year ago
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    oops. the 3/2 is positive, so it's perpendicular to the line with slope of -2/3. That looks like lines 2 and 3 are perpendicular

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