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anonymous

  • one year ago

Point E is located at (2, -3), and point F is located at (-2, -1). Find the y value for the point that is the distance from point E to point F.

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  1. anonymous
    • one year ago
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    *that is 3/4 the distance

  2. campbell_st
    • one year ago
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    well look at the y values how far from -3 to -1...?

  3. anonymous
    • one year ago
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    2 units right?

  4. campbell_st
    • one year ago
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    correct so what is 3/4 of 2...?

  5. anonymous
    • one year ago
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    1.5

  6. anonymous
    • one year ago
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    if thats it, it's not one of the choices. could it be -1.5?

  7. campbell_st
    • one year ago
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    |dw:1439496849476:dw| great so count up 1.5 from -3 where do you finish..?

  8. anonymous
    • one year ago
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    -1.5?

  9. campbell_st
    • one year ago
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    ok... so are you being asked to find the point that divided the interval in the ratio 3:4

  10. anonymous
    • one year ago
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    yes

  11. anonymous
    • one year ago
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    okay i think i get it now, thanks a lot!

  12. anonymous
    • one year ago
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    idk how to give you a medal though

  13. campbell_st
    • one year ago
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    ok... so the ratio is 3:4 the ratio is m:n and the points are E, F then the formula is \[y = \frac{n \times y_{F} + m \times y_{E}}{m + n} \]

  14. campbell_st
    • one year ago
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    so if you have a point P between E and F then using fractions \[\frac{EP}{PF} = \frac{3}{4}\] so after crossing multiplying 4EP = 3PF that's provided its an internal division

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