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Hotskull

  • 3 years ago

Determine whether the system of linear equations has one and only one solution, infinitely many solutions, or no solution. 2x − y = 5 3x + y = −7

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  1. Hotskull
    • 3 years ago
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    so far i hve 5x=-2? this is right

  2. Sujay
    • 3 years ago
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    Yup, you got it right so far.

  3. Hotskull
    • 3 years ago
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    so, do i hve to divide -2 by 5 now?

  4. Sujay
    • 3 years ago
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    Yup!

  5. Hotskull
    • 3 years ago
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    okay, so i got.-0.4

  6. Sujay
    • 3 years ago
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    Perfect, now substitute it into either equation to come up with the value of the other variable.

  7. Hotskull
    • 3 years ago
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    okay so now i have 2(-0.4)-y=5. den -0.8-y=5. dont i add 0.8 to 5? if so i got 4.2? i den plug it into one of the equations 2x-y=5 and the answer isnt the same. wat did i do wrong?

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