# Algebra

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

1. I think it is I. Division

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?

4. Yes.

Don't forget PEMDAS!

posted by Ms. Sue
5. Thank you.

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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