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sonja_lee2

  • 3 years ago

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

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  1. wio
    • 3 years ago
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    First solve for y in the first equation

  2. wio
    • 3 years ago
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    Can you do it?

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

  4. ChmE
    • 3 years ago
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    Watch your negative sign

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

  6. sonja_lee2
    • 3 years ago
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    substitution

  7. ChmE
    • 3 years ago
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    Okay, retry to solve the first equation for y.

  8. sonja_lee2
    • 3 years ago
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    idk cause thats how i thought u do it

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

  10. sonja_lee2
    • 3 years ago
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    are u sure??

  11. ChmE
    • 3 years ago
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    You have to reverse the sign

  12. ChmE
    • 3 years ago
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    yes

  13. sonja_lee2
    • 3 years ago
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    okay nvm i see how u did it

  14. ChmE
    • 3 years ago
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    now we will substitute this into the second equation

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

  16. sonja_lee2
    • 3 years ago
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    ok

  17. ChmE
    • 3 years ago
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    can you solve for x by yourself now?

  18. sonja_lee2
    • 3 years ago
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    i got 0

  19. ChmE
    • 3 years ago
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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

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

  21. ChmE
    • 3 years ago
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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

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

  23. sonja_lee2
    • 3 years ago
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    yes

  24. ChmE
    • 3 years ago
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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

  25. ChmE
    • 3 years ago
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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

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