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March 29, 2017

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Find all solutions to the following system of equations:

x + 3y + 2z = 6
-3x + y + 5z = 29
-2x - 3y + z = 14

This just did not work out for me. Here is my work:

I first solved Equation #1 for x.

x = -3y - 2z + 6

Then, I did substitution, and replaced x for -3y - 2z + 6 in equations #2 and 3.

-3(-3y - 2z +6) + y + 5z = 29
-2(-3y - 2z +6) - 3y + z = 14

That is the same as:

10y + 11z = 47
and
3y + 5z = 26

Would elimination be the next step?

Thanks, Liese

  • Algebra - ,

    why not use elimination right from the beginning
    look at the y's
    If you add the first and the last, they are gone
    If you add 3times the second to the last, they are gone.

    now you have 2 equations in x and z

    not bad....

  • Question - ,

    I finished it up like I said with elimination and got y = -3. Is this correct?

    If not, I'll try it the way you suggested with elimination the whole way through.

    Thanks, Liese

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