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sloppycanada

  • one year ago

Is there a difference between solving an equation using the elimination method instead of the substitution method? really bad at the substitution method, much rather use the elimination.

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  1. Jack1
    • one year ago
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    no, no difference in answers, just difference in the approach, s'all

  2. UsukiDoll
    • one year ago
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    elimination method takes out a variable (x or y) and then you can just solve (for x or y) meanwhile substitution means x or y has to be something and then it gets plugged back into the first or second equation... combine like terms solve for x or y lalalalal but both procedures should produce the same results.

  3. sloppycanada
    • one year ago
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    Oh okay, so if I solve this question - Solve 4x + 3y = 13 by the substitution method. x + y = 4 using substitution I'll get the same answer?

  4. UsukiDoll
    • one year ago
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    you should get the same answer.

  5. UsukiDoll
    • one year ago
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    trying to think what would be easier.. ah take the second equation and have either x or y by itself

  6. UsukiDoll
    • one year ago
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    take x+y = 4 and rearrange it having either x = ? or y = ?

  7. Jack1
    • one year ago
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    4x + 4y = 16 4x = 16 - 4y 4x = 13 - 3y 16 - 4y = 13 - 3y is this elimination or am i doing it wrong again?

  8. UsukiDoll
    • one year ago
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    o_O

  9. UsukiDoll
    • one year ago
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    ok I'll give an example where elimination can be used x+y=2 x-y=5 now use elimination method @Jack1

  10. Jack1
    • one year ago
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    dont give me that look

  11. Jack1
    • one year ago
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    ;P

  12. Jack1
    • one year ago
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    2-y = 5+y ...? im serious, i dont remember this properly hey

  13. sloppycanada
    • one year ago
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    So for this I got x = 1 and y = 3

  14. Jack1
    • one year ago
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    then solve for y, yeah?

  15. UsukiDoll
    • one year ago
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    for my example x+y=2 x-y=5 add the two equations together @Jack1

  16. UsukiDoll
    • one year ago
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    @sloppycanada that's right when you plug in x =1 and y=3 your equations will be true!

  17. UsukiDoll
    • one year ago
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    4x + 3y = 13 x + y = 4 since x = 1 and y =3 4(1)+3(3) =13 4+9=13 13=13 Similarly 1+3=4 4=4

  18. Jack1
    • one year ago
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    right, now i remember, cheers @UsukiDoll

  19. sloppycanada
    • one year ago
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    Alright so point is - I don't need to use the sub method when it says too.

  20. sloppycanada
    • one year ago
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    thanks!

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