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85295james

  • 2 years ago

Write a rule for the linear function in the graph.

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  1. 85295james
    • 2 years ago
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    the lines are (4,3) (3,-1)

  2. 85295james
    • 2 years ago
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    A. y =-4 x + 13 B. y = -4x – 13 C. y =4 x – 13

  3. theEric
    • 2 years ago
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    Do you know the general "point-slope" formula?\[y=mx+b\] Are you familiar with that?

  4. 85295james
    • 2 years ago
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    no

  5. theEric
    • 2 years ago
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    Alright, well this formula is how you define a line! For a line, the "m" and "b" variables will be numbers instead. "m" is "slope" and "b" is "y-intercept" Are either of those familiar to you? And are you familiar with plotting points on a graph using a formula?

  6. 85295james
    • 2 years ago
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    |dw:1346091835332:dw|

  7. theEric
    • 2 years ago
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    I can immediately answer your problem, but I want to work it throug with you.

  8. theEric
    • 2 years ago
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    And I agree with your plot! :)

  9. 85295james
    • 2 years ago
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    yes i would like that

  10. eliassaab
    • 2 years ago
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    You do not really need to do all this for a multiple choice question.

  11. eliassaab
    • 2 years ago
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    Just replace in the 3 equations and see which one works

  12. eliassaab
    • 2 years ago
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    C would be the answer.

  13. theEric
    • 2 years ago
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    eliassaab is correct. eliassaab recommends that you take the x value of one point and put it into the equation, you should get the y value of that point from calculating the correct option.

  14. theEric
    • 2 years ago
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    There's another quick method to determine if a formua might be right, just by looking to see if "m" and "b" are positive on your plot and then finding the choice that has those same positive or negatives. That requires a little knowledge of how it works anyway. Wold you like to work through this as if there are no multiple choices?

  15. theEric
    • 2 years ago
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    That would be helpful for both finding the answer without choices, and understanding the concept some more in a different way than the substitution method of eliassaab.

  16. 85295james
    • 2 years ago
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    thank you

  17. theEric
    • 2 years ago
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    Would you like to work through it as if there were no multiple choice, then? :) eliassaab's method will work every time for multiple choice, though.

  18. theEric
    • 2 years ago
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    By looking at a picture with no points, you can narrow down the possible equations. By going through some algebra, you can find the equation by knowing any two points on the line.

  19. 85295james
    • 2 years ago
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    no thank you but i need more help with other questions

  20. theEric
    • 2 years ago
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    Alright. I'll look for them on here! :)

  21. theEric
    • 2 years ago
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    And C is the answer, as eliassaab said :)

  22. 85295james
    • 2 years ago
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    thanks =)

  23. theEric
    • 2 years ago
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    No problem!!

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