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anonymous

  • 4 years ago

3x - y = -4 5x + 4y = -8

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  1. anonymous
    • 4 years ago
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    What do we have to do ?

  2. anonymous
    • 4 years ago
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    find the points that it would be on the graph

  3. anonymous
    • 4 years ago
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    Umm it would be on a graph oh darn lol i thought a fraction

  4. anonymous
    • 4 years ago
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    Hero will be here to help you

  5. Mertsj
    • 4 years ago
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    From the first equation y = 3x+4 Replace y in the second equation and solve. Can you do that this time?

  6. anonymous
    • 4 years ago
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    And some others that are a bit smart :P

  7. anonymous
    • 4 years ago
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    Solve simultaneously multiply Eq1 by4 and andd to Eq2 to get x

  8. anonymous
    • 4 years ago
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    x=-24/17

  9. Mertsj
    • 4 years ago
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    \[5x+4(3x+4)=-8\]

  10. anonymous
    • 4 years ago
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    I have 17x + 16 = -8. What to do after that?

  11. Mertsj
    • 4 years ago
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    Subtract 16 from both sides.

  12. anonymous
    • 4 years ago
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    for x I have -1.41

  13. Mertsj
    • 4 years ago
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    that it correct but it might be better to leave it in it's exact form which is -24/17

  14. Mertsj
    • 4 years ago
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    Because now you have to find y which is 3x+4

  15. Mertsj
    • 4 years ago
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    \[y=3(-\frac{24}{17})+4\]

  16. Mertsj
    • 4 years ago
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    \[y=\frac{-72}{17}+4\]

  17. Mertsj
    • 4 years ago
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    \[y=\frac{-72}{17}+\frac{68}{17}=\frac{-4}{17}\]

  18. Mertsj
    • 4 years ago
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    So the solution is (-24/17,-4/17)

  19. anonymous
    • 4 years ago
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    Thanks

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spraguer (Moderator)
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