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lunitaboo

  • one year ago

I cant seem to find the answer to this can anyone help me?

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  1. lunitaboo
    • one year ago
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  2. jdoe0001
    • one year ago
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    well, do you know how to do system of equations?

  3. lunitaboo
    • one year ago
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    yeahbut i cant seem to find the answer i get (4,6) -.- ? @jdoe0001

  4. jdoe0001
    • one year ago
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    $$ \begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 \\ \hline \end{matrix} \text{multiply the 2nd by -1}\\ \begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 & \times -1 \\ \hline\\ ? & ? & ? \end{matrix} $$

  5. Luigi0210
    • one year ago
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    matrix seemed easier

  6. drotzmann
    • one year ago
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    its the last one... use cramers rules

  7. drotzmann
    • one year ago
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    (5,1)

  8. jdoe0001
    • one year ago
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    matrix? w000t?

  9. jdoe0001
    • one year ago
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    hmmm

  10. jdoe0001
    • one year ago
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    hold on

  11. jdoe0001
    • one year ago
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    -1 will not the trick

  12. lunitaboo
    • one year ago
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    thanks @drotzmann

  13. amistre64
    • one year ago
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    id suggest just testing out the options to see what fits ....

  14. drotzmann
    • one year ago
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    No problem, i do suggest using youtube to learn how to do Cramer's Rule

  15. lunitaboo
    • one year ago
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    omg i had totaly forgor that system @amistre64

  16. lunitaboo
    • one year ago
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    youtubes super helpful too i also forgot about that too ._. @drotzmann

  17. drotzmann
    • one year ago
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    haha:)

  18. jdoe0001
    • one year ago
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    well, to cancel out the "y" I'd just do 6 * n = 7 n = 7/6 thus 6 * 7/6 = 7 that gives you a 7y at the bottom, thus cancelling out "y"

  19. amistre64
    • one year ago
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    in kindergarten, i was confronted by a hole shaped like a triangle, and 4 blocks oddly shaped blocks. instead of measuring stuff and trying to work out some complicated things ... i just picked up each block till i found the one that fit :)

  20. jdoe0001
    • one year ago
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    $$ \begin{matrix} 5x &+7y & =32 \\ 8x & +6y & =46 \\ \hline \end{matrix}\\ \text{multiply the 2nd by -7/6}\\ \begin{matrix} 5x &+7y & =32 \\ -\frac{28}{3}x & -7y & =-\frac{161}{3} & \times \color{blue}{-\frac{7}{6}} \\ \hline\\ ? & 0 & ? \end{matrix} $$

  21. drotzmann
    • one year ago
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    @jdoe0001 ....one of us is on crack... i have no idea what you are doing. Cramer's Rule is so much more easier

  22. jdoe0001
    • one year ago
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    hehhe, yes, because is a 2x2, well, yeah, I gather you'd use that :)

  23. drotzmann
    • one year ago
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    three 2x2's to be correct ;)

  24. jdoe0001
    • one year ago
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    hehe, yes, not sure ... if it'd be .... I guess it depends I mean, off you have to get the discriminant, then 2 more discriminants

  25. jdoe0001
    • one year ago
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    determinants rather

  26. drotzmann
    • one year ago
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    yup:) exactly

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