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anonymous

  • one year ago

what is the equation of the line that passes through (1,3) and (-2,-3)

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  1. anonymous
    • one year ago
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    can you find the slope first? then find the y intercept?

  2. anonymous
    • one year ago
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    i suggest you plot the points and connect them with a line

  3. anonymous
    • one year ago
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    but you can just use this . slope = (y2 - y1) / (x2 - x1)

  4. anonymous
    • one year ago
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    so is the slope 2?

  5. anonymous
    • one year ago
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    I don't know how to do any of this that why I needed help.

  6. anonymous
    • one year ago
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    yep slope is 2, so have you ever seen this y = mx + b?

  7. anonymous
    • one year ago
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    m is the slope b is the y intercept

  8. anonymous
    • one year ago
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    so can you plug the slope you found into that equation?

  9. anonymous
    • one year ago
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    yea I know but what is the y intercept?

  10. anonymous
    • one year ago
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    we are going to find that after you plug in the slope

  11. anonymous
    • one year ago
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    so y=2?

  12. anonymous
    • one year ago
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    y = 2x + b, 2 = m = slope

  13. anonymous
    • one year ago
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    okay what do I do after that?

  14. anonymous
    • one year ago
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    ok so we have some points on the line pick one of them to use

  15. anonymous
    • one year ago
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    pick either one

  16. anonymous
    • one year ago
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    (1,3)

  17. anonymous
    • one year ago
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    ok so we have (1, 3) that is the point where x = 1 and y = 3, so lets plug 1 and 3 into this equation y = 2x + b

  18. anonymous
    • one year ago
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    so 1=b?

  19. anonymous
    • one year ago
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    correct so now you have everything you need for the equation y = 2x + 1

  20. anonymous
    • one year ago
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    okay thankyou!

  21. anonymous
    • one year ago
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    yw

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spraguer (Moderator)
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