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trailwave

Solve the system by using elimination or elimination with multiplication. 3x + 4y = -2 and 2x - 3y = 10

  • one year ago
  • one year ago

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  1. chelseachels
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    Is it together or are they two separate problems?

    • one year ago
  2. trailwave
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    They are together.

    • one year ago
  3. phi
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    3x + 4y = -2 2x - 3y = 10 one way is to multiply the top equation (that means every term BOTH sides) by -2 and multiply the 2nd equation by +3 what do you get for the 2 new equations ?

    • one year ago
  4. trailwave
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    Is the new equations -6x+-8y=4 and 6x+9y=30? Or did I do something wrong?

    • one year ago
  5. phi
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    close . redo the 2nd equation.

    • one year ago
  6. trailwave
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    Do you change the + to a -?

    • one year ago
  7. phi
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    3*(2x-3y)= 3*10 6x -9y = 30

    • one year ago
  8. phi
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    now add the 2 equations -6x+ -8y=4 6x+ -9y=30

    • one year ago
  9. trailwave
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    Like this? 6x-9y=30 or is it like this? 6x-(-9y)=30?

    • one year ago
  10. phi
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    are you asking what you get when you multiply the 2nd equation by 3 ? 2x + -3y = 10 3 times each term: 3*2x + 3* -3y = 3*10 there is only 1 minus sign, and it stays you get 6x -9y = 30

    • one year ago
  11. trailwave
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    Oh, okay. I get it. Sorry, I got kicked off for a few minutes.

    • one year ago
  12. trailwave
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    Then, you add them and the 6's cancel out right? Then you would have 0x+17y=34 right or would it be a -?

    • one year ago
  13. trailwave
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    Okay, thank you so much for your help! I finally figured out the answer.

    • one year ago
  14. phi
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    now add the 2 equations -6x+ -8y=4 6x+ -9y=30

    • one year ago
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