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Jasmineplayhouse

use the elimination method to solve the system of equations. a+7b=7 a+2b=-3

  • one year ago
  • one year ago

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  1. hartnn
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    subtract the 2 equations, what u get ?

    • one year ago
  2. Jasmineplayhouse
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    I am sorry don't understand

    • one year ago
  3. hartnn
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    let me give you an example on how to subtract equations, let the 2 equation be say, 2x+3y =7 2x-3y =2 now if i subtract the 1st equation from 2nd equation, i get (2x-3y) - (2x+3y) = 2-7 so, 2x-2x-3y-3y=-5 0-6y=-5 so, y = 5/6 in same manner, you try for your question of a+7b=7 a+2b=-3

    • one year ago
  4. Jasmineplayhouse
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    b=5/4?

    • one year ago
  5. hartnn
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    very close,but its 7b-2b = 7-(-3) can you proceed ?

    • one year ago
  6. Jasmineplayhouse
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    9b=4

    • one year ago
  7. hartnn
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    7-2 = 5 7- (-3) = 7+3 =10 -_-

    • one year ago
  8. Jasmineplayhouse
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    so b=5/10?

    • one year ago
  9. hartnn
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    7b-2b = 7-(-3) 5b = 10 b=10/5 = 2 got this ?

    • one year ago
  10. Jasmineplayhouse
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    still confused

    • one year ago
  11. hartnn
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    on which step ?

    • one year ago
  12. Jasmineplayhouse
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    7-(-3) since it has a minus sign in front i believed it was to be subtracted not added.

    • one year ago
  13. hartnn
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    - * - = + so, 7 - (-3) became 7+3

    • one year ago
  14. Jasmineplayhouse
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    ok now i understand

    • one year ago
  15. Jasmineplayhouse
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    so the final answer would be 2

    • one year ago
  16. hartnn
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    b=2 you still need to find 'a' put b=2 in any 1 of the original equation to get a

    • one year ago
  17. kelliegirl33
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    multiply the first equation by a -1. Doing this will cancel out the a's. You can then solve for b. Once you have solved b, substitute that in for b in either of the original equations and you will solve a. You can then check your answer by subbing in known variables in either of the original equations and if they equal, your answers are correct :)

    • one year ago
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