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anonymous

  • one year ago

Select the equation of a line that is perpendicular to the line on the graph and passes through the point (-1, 2)

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  1. anonymous
    • one year ago
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    The graph has 2 points Point A: (-2, 0) Point B: (0, -1)

  2. anonymous
    • one year ago
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    point a because perpendicular means the opposite so therefore the opposite of the y axis will be -2

  3. anonymous
    • one year ago
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    Y=2x+4 Y=-2x+4 Y=-1/2x+2 Y=2x-1

  4. anonymous
    • one year ago
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    @denishays111

  5. Nnesha
    • one year ago
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    first you need to find slope of two points (-2,0)(0,-1) formula to find slope is \[\huge\rm \frac{ y_2 -y_1}{ x_2 -x_1 }\] plug in y and x values

  6. anonymous
    • one year ago
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    (-1)-0= 0-(-2)

  7. anonymous
    • one year ago
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    So -1/2

  8. Nnesha
    • one year ago
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    yep right :=) now perpendicular slope is negative reciprocal for example if slope of first equation is - a/b then slope of perpendicular equation would be positive b/a

  9. Nnesha
    • one year ago
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    so what is the slope of 2nd equation ?

  10. anonymous
    • one year ago
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    -2x?

  11. anonymous
    • one year ago
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    Sorry 2x

  12. Nnesha
    • one year ago
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    yep right

  13. anonymous
    • one year ago
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    So would the answer be y=2x+4

  14. Nnesha
    • one year ago
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    so equation of slope intercept form is y =mx+b where m is slope so substitute m for 2 and pick on of order pair to plug in value of x and y solve for b

  15. Nnesha
    • one year ago
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    so how did you get A ? and how do you know it's not D ?

  16. anonymous
    • one year ago
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    Because when i look at the line The y intercept must pass through (-1, 2)

  17. anonymous
    • one year ago
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    So i thought the line would be slanted the other way

  18. anonymous
    • one year ago
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    So its d?

  19. Nnesha
    • one year ago
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    perpendicular line passes through the point (-1,2) so substitute x and y for (-1,2)

  20. Nnesha
    • one year ago
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    nope first one is correct i just wanted to know how did YOU get A :=)

  21. anonymous
    • one year ago
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    Ok, thank you very much

  22. Nnesha
    • one year ago
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    my pleasure :=)

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