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phury

  • one year ago

solve using substitution, show work -4x + y = 6 -5x - y = 21

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  1. KAOS|abdullah
    • one year ago
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    find x in terms of y in 1st eqn. ,substitute in the 2nd eqn. and u get the value of y...equate that and u get the value of x

  2. phury
    • one year ago
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    example?

  3. shaik0124
    • one year ago
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    |dw:1358532187958:dw|

  4. phury
    • one year ago
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    i am sorry, i have no idea what that says.

  5. KAOS|abdullah
    • one year ago
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    take 2 any equations like 2x+3y=11---(1) and 3x+5y=12----(2) .....from (1) u can find that x=(11-3y)/2...substitute this x value in eqn. (2) and solve...u'll get the value of y

  6. shaik0124
    • one year ago
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    -9x-27=0 -9x=27 x=-3 now u get y by substuting x value in any one of the equations

  7. KAOS|abdullah
    • one year ago
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    and then substitute that value of y in eqn (1) or (2) and get the value of x

  8. phury
    • one year ago
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    i understabd substituting the final value, i just have to get it first. i dont know how to solve -4x + y = 6

  9. shaik0124
    • one year ago
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    what i have done is i got the value of y from 2nd equation and substituted in first so by substituting y in 1st equation u will get equation in x terms from u will get x value and substitute x value in any equation and get y

  10. shaik0124
    • one year ago
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    just add+4x on both sides then u will get y|dw:1358532633268:dw|

  11. phury
    • one year ago
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    yeah, i got y = 6 + 4x

  12. shaik0124
    • one year ago
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    now u substitute y value in the other equation and u will get the equation in x terms ok do this

  13. phury
    • one year ago
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    -5x + 6 + 4x

  14. phury
    • one year ago
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    -5x + 6 + 4x = 21 -1x + 6 = 21 -1x = 15 x = -15 ?

  15. shaik0124
    • one year ago
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    no it is -5x+4x-6=21 now solve

  16. shaik0124
    • one year ago
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    |dw:1358533659839:dw|

  17. phury
    • one year ago
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    move the 6 and 4x and the operation changes? thought i forgot something -5x + 4x - 6 = 21 -1x - 6 = 21 -1x = 26 x = -26

  18. shaik0124
    • one year ago
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    yes now answer is correct

  19. phury
    • one year ago
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    thanks alot (:

  20. shaik0124
    • one year ago
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    now u substitute x value in any equation u will get y value

  21. phury
    • one year ago
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    -4 (-26) + y = 6 104 + y = 6 y = 98

  22. shaik0124
    • one year ago
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    yes right answer

  23. phury
    • one year ago
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    savior <3

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