Algebra

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

asked by LadyPhantomhive
  1. I think it is I. Division

    posted by LadyPhantomhive
  2. No. Study this site and memorize PEMDAS.

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

    posted by Ms. Sue
  3. Oh okay so its multiplication?

    posted by LadyPhantomhive
  4. Yes.

    Don't forget PEMDAS!

    posted by Ms. Sue
  5. Thank you.

    posted by LadyPhantomhive
  6. You are welcome.

    posted by Ms. Sue
  7. I would subtract first to eliminate y
    65 y is in both

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

    posted by Ms. Sue
  9. 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

    posted by Reiny

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