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Saiyan

  • one year ago

Need help I will give medal

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  1. Saiyan
    • one year ago
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  2. campbell_st
    • one year ago
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    well the y- intercept is given (0, -4.5) so that means you choices are the 1st or 3rd equations... so substitute -2 into both equations and see which gives y = -23.5 then when you have 1 equation just check against the 3rd point

  3. Saiyan
    • one year ago
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    ok hold on

  4. Saiyan
    • one year ago
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    I put 2 in for x and still didnt get -23.5

  5. campbell_st
    • one year ago
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    which equation did you use..?

  6. Saiyan
    • one year ago
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    1 and 3

  7. Saiyan
    • one year ago
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    get out of here

  8. Saiyan
    • one year ago
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    hello

  9. campbell_st
    • one year ago
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    well in equation 1 \[-2.5 \times (-2)^2 + 4.5 \times (-2) - 4.5 = ?\]

  10. Saiyan
    • one year ago
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    sorry -10+-9-4.5

  11. campbell_st
    • one year ago
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    so is that equal to the y value you need..?

  12. Saiyan
    • one year ago
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    -24.5

  13. Saiyan
    • one year ago
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    its not -23.5 if that is what you are asking

  14. campbell_st
    • one year ago
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    you may want to check that -19 - 4.5 = -23.5 u

  15. Saiyan
    • one year ago
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    oops missed that

  16. Saiyan
    • one year ago
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    so its the first one

  17. campbell_st
    • one year ago
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    well you may like the check with the 3rd point... just to make sure

  18. Saiyan
    • one year ago
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    ok i will hold on

  19. Saiyan
    • one year ago
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    for the second one i got -4.5

  20. campbell_st
    • one year ago
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    I think you need to check your calculations \[-2.5\times (4)^2 + 4.5 \times 4 - 4.5 = ?\]

  21. Saiyan
    • one year ago
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    i put in a -2

  22. campbell_st
    • one year ago
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    I'm using the 3rd point on the 1st equation...

  23. Saiyan
    • one year ago
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    but its -26.5

  24. campbell_st
    • one year ago
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    Isn't that what you want, for the 3rd point in the 1st equation...

  25. Saiyan
    • one year ago
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    i just want to know how to do this

  26. campbell_st
    • one year ago
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    the 3rd point x = 4 -2.5 * 4^2 = -40 4.5 * 4 = 18 - 4.5 ---------- -26.5 so the 1st equation is true for the 3 points... I wouldn't go any further

  27. campbell_st
    • one year ago
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    ok... so do you understand that the y- intercept for the points given is (0, -4.5)..?

  28. Saiyan
    • one year ago
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    ohhhh ok i get what your saying

  29. campbell_st
    • one year ago
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    so substitute x = 0 into the equations and the only ones that give y = -4.5 are the 1st and 3rd so next use the point x = -2 y = -23.5 substitute x = -2 and see if you get y = -23.5 this happens in the 1st equation, the 3rd equation gives y = -17.5 I think... so lastly use the 3rd point to check the 1st equation is the answer... the point (4, -26.5) substitute x = 4 and see if you get -26.5 that's a simple process that uses elimination...using some observation and arithmetic

  30. Saiyan
    • one year ago
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    ok thx

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