Algebra

posted by LadyPhantomhive

To solve the following system of equations by elimination, which operation would you perform first?
234x + 65y = 219
1225x + 65y = 427
F. addition
G. subtraction
H. Multiplication
I. division

  1. LadyPhantomhive

    I think it is I. Division

  2. Ms. Sue

    No. Study this site and memorize PEMDAS.

    http://www.mathsisfun.com/operation-order-pemdas.html

  3. LadyPhantomhive

    Oh okay so its multiplication?

  4. Ms. Sue

    Yes.

    Don't forget PEMDAS!

  5. LadyPhantomhive

    Thank you.

  6. Ms. Sue

    You are welcome.

  7. Damon

    I would subtract first to eliminate y
    65 y is in both

  8. Ms. Sue

    Oops! Thanks, Damon. You're right. I goofed.

  9. Reiny

    Since both equations contain 65y,
    subtractions would make the y's go away

    subtract the first equation from the 2nd to get
    991x = 208
    x = 208/991

    sub back into the first:
    234(208/991) + 65y = 219
    65y = 219 - 48672/991 = 168357/991
    y = 168357/64415

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