# 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

I think it is I. Division

2. Ms. Sue

No. Study this site and memorize PEMDAS.

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

Oh okay so its multiplication?

4. Ms. Sue

Yes.

Don't forget PEMDAS!

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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