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anonymous

  • 4 years ago

please help me solve using substitution method -2x + 0y = -14 x + 11y = 18

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  1. anonymous
    • 4 years ago
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    x=7

  2. anonymous
    • 4 years ago
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    Do I multiply the 'y' variables ? like 0y (11) and (0) 11y to zero it out?

  3. anonymous
    • 4 years ago
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    yea.........

  4. anonymous
    • 4 years ago
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    but I got x = -2, what did I do wrong?

  5. anonymous
    • 4 years ago
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    how did you get x = 7 pls?

  6. anonymous
    • 4 years ago
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    & plug in the value of x in other equation so.that u can get value of "y".

  7. anonymous
    • 4 years ago
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    thank you

  8. anonymous
    • 4 years ago
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    |dw:1327167481162:dw|

  9. anonymous
    • 4 years ago
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    dont I have to add -14 + 18?

  10. anonymous
    • 4 years ago
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    -2x + 0y = -14 x + 11y = 18 -2x = 4 x = -2

  11. anonymous
    • 4 years ago
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    I'm confused

  12. anonymous
    • 4 years ago
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    sorry

  13. anonymous
    • 4 years ago
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    ohhh ok I got it, I was using the elimination method...so sorry

  14. anonymous
    • 4 years ago
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    its ok :-)

  15. anonymous
    • 4 years ago
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    the 2nd equation doesnt check out so I guess it is not a solution

  16. anonymous
    • 4 years ago
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    jst putt value of x in 2nd equation & u'll get value of "y"...........ok

  17. anonymous
    • 4 years ago
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    ok ty

  18. radar
    • 4 years ago
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    First you decide which variable is to be substituted, x oy. In this case you can solve for x in the first equation alone: -2x + 0y=-14 obviously x=7 It means we now we have a value to substitute for x in the second equation x+11y = 18 substituting the value 7 for x we get 7+11y = 18 Now simply solve for y subtracting 7 from both sides getting: 11y=11 making y=1.

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spraguer (Moderator)
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