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ValentinaT

  • 2 years ago

Can someone check my work?

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  1. hba
    • 2 years ago
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    Sure thing.

  2. ValentinaT
    • 2 years ago
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    I have to solve systems of equations, and I chose the elimination method, but for some reason the last step isn't working. b) 7x – 3y = 20 5x + 3y = 16 Elimination Method 7x – 3y = 20 5x + 3y = 16 So with the elimination method you want to manipulate one equation so that when you add the two equations together one will cancel out. You have: 7x – 3y = 20 5x + 3y = 16 Eliminate one variable. Since the sum of the coefficients of y is 0, add the equations to eliminate y. 7x – 3y = 20 5x + 3y = 16 12x = 36 Now we can find: x = 3 In order to solve for y, take the value for x and substitute it back into either one of the original equations. 5(3) + 3y = 16 15 + 3y = 16

  3. hba
    • 2 years ago
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    ^ This

  4. hba
    • 2 years ago
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    Is actually messed up.

  5. ValentinaT
    • 2 years ago
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    Could you show me where i went wrong?

  6. hba
    • 2 years ago
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    I cannot understand how many ques you have posted up there . Can you please post one ques at a time.

  7. ValentinaT
    • 2 years ago
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    I only posted one question..? I just asked if you could show me where in the problem did I do something wrong.

  8. hba
    • 2 years ago
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    What are the equations and what is your answer for that.

  9. hba
    • 2 years ago
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    I am sorry i am having a hard time understanding what you hav done above.@ValentinaT

  10. ValentinaT
    • 2 years ago
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    Okay. The equation is: 7x – 3y = 20 5x + 3y = 16 I used the elimination method of solving systems to solve it. So with the elimination method you want to manipulate one equation so that when you add the two equations together one will cancel out. You have: 7x – 3y = 20 5x + 3y = 16 Eliminate one variable. Since the sum of the coefficients of y is 0, add the equations to eliminate y. 7x – 3y = 20 5x + 3y = 16 12x = 36 Now we can find: x = 3 In order to solve for y, take the value for x and substitute it back into either one of the original equations. 5(3) + 3y = 16 15 + 3y = 16

  11. ciara_chap3
    • 2 years ago
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    your answer should be x=3 y=1/3

  12. ValentinaT
    • 2 years ago
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    A fraction for y?

  13. hba
    • 2 years ago
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    15+3y=16 1)subract both sides by 15 2)divide both sides by 3

  14. hba
    • 2 years ago
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    There can be a fraction and you can always check by putting the (x,y) value in your orignal equation and checking If, LHS=RHS then your answer is correct :)

  15. ValentinaT
    • 2 years ago
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    Thank you.

  16. hba
    • 2 years ago
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    Welcome :)

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