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sonja_lee2

what is the solution of the system equation? -2x+y=3 8x-4y=-12

  • one year ago
  • one year ago

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  1. wio
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    First solve for y in the first equation

    • one year ago
  2. wio
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    Can you do it?

    • one year ago
  3. sonja_lee2
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    yeah its y=-2x+3

    • one year ago
  4. ChmE
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    Watch your negative sign

    • one year ago
  5. ChmE
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    Do you want to use elimination method or substitution method to solve this problem?

    • one year ago
  6. sonja_lee2
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    substitution

    • one year ago
  7. ChmE
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    Okay, retry to solve the first equation for y.

    • one year ago
  8. sonja_lee2
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    idk cause thats how i thought u do it

    • one year ago
  9. ChmE
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    -2x + y = 3 +2x -2x + y = 3 + 2x y = 3 + 2x

    • one year ago
  10. sonja_lee2
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    are u sure??

    • one year ago
  11. ChmE
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    You have to reverse the sign

    • one year ago
  12. ChmE
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    yes

    • one year ago
  13. sonja_lee2
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    okay nvm i see how u did it

    • one year ago
  14. ChmE
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    now we will substitute this into the second equation

    • one year ago
  15. ChmE
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    8x - 4(3 + 2x) = -12

    • one year ago
  16. sonja_lee2
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    ok

    • one year ago
  17. ChmE
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    can you solve for x by yourself now?

    • one year ago
  18. sonja_lee2
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    i got 0

    • one year ago
  19. ChmE
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    There is something wrong. Double check your problem and make sure you typed the original correctly 8x - 12 - 8x = -12 0=0 The x term drops out completely, this shouldn't happen

    • one year ago
  20. sonja_lee2
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    yeah i guess so thats why i ased cause i was getting confused

    • one year ago
  21. ChmE
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    I want to go back to this equation 8x - 12 - 8x = -12 rewritten as 8x - 12 = 8x - 12 lets get rid of the -12 8x = 8x then the 8's x=x So we can see that x equals all real numbers

    • one year ago
  22. ChmE
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    This question is written badly. You are positive this is the correct question?

    • one year ago
  23. sonja_lee2
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    yes

    • one year ago
  24. ChmE
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    I'm going to admit that I am confused as to our answer as well. Because x can equal anything which gives us an infinite amount of solutions. x=y/2 - 3/2 8(y/2 - 3/2) - 4y = -12 4y -12 - 4y = -12 y can be anything as well I'd say there is any infinite amount of solutions

    • one year ago
  25. ChmE
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    This is a weird problem. Sry that I couln't help get an exact answer. All of our steps our correct, we didn't make any mistakes

    • one year ago
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