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anonymous

  • 5 years ago

find the equation of the line that contains the point (8,1) and has slope -5....thanks for the help!

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  1. amistre64
    • 5 years ago
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    y = -5(x-8)+1

  2. amistre64
    • 5 years ago
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    y = -5x +41

  3. anonymous
    • 5 years ago
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    do i add -5x to both sides to solve for y?

  4. anonymous
    • 5 years ago
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    its already solved for y. Do you mean solve for x in terms of y?

  5. anonymous
    • 5 years ago
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    I guess I wanted to know if anything further needed to be done or if this was the complete answer. Sorry...I am horrible at math! :)

  6. amistre64
    • 5 years ago
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    there are many ways to express the equation of a line; this is the most common form tho.

  7. anonymous
    • 5 years ago
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    yes the usual is y=mx+c in wich this is already displayed

  8. amistre64
    • 5 years ago
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    5x+y = 41 y = -5x +41 y-1 = -5(x-8) 5x +y -41 = 0

  9. anonymous
    • 5 years ago
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    m being the gradient and c the intercept, usually the way thats most useful

  10. anonymous
    • 5 years ago
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    gotcha...thank you for the help and for the extra examples. I really appreciate it!

  11. anonymous
    • 5 years ago
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    no problem :D

  12. anonymous
    • 5 years ago
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    one more question....would the equation be the same if I have two points rather than a slope? Examples points (0,4) and (1.-3)

  13. anonymous
    • 5 years ago
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    sorry that should be (1,-3)

  14. anonymous
    • 5 years ago
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    The slope is found using diff in y / diff in x

  15. anonymous
    • 5 years ago
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    \[\frac{4-(-3)}{1}\] = -7 so the equation becomes y=-7x+4

  16. anonymous
    • 5 years ago
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    so you subtracted the two y points from each other and the two x points from each other, than divide that to find the slope? so in the equation y represents the slope?

  17. anonymous
    • 5 years ago
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    sorry missed the -1 in the denominator

  18. anonymous
    • 5 years ago
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    The y represents the slope and the intercept y=Mx+C where M is the slope and C is where it crosses the y axis

  19. anonymous
    • 5 years ago
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    So the equation represent the line

  20. anonymous
    • 5 years ago
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    so in its fullness we get \[y= \frac{(4-(-3))}{(0-1)}x + 4\]

  21. anonymous
    • 5 years ago
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    I see it now! :D

  22. anonymous
    • 5 years ago
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    kewl :)

  23. anonymous
    • 5 years ago
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    thank u for ur patience with me!

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