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
9 answers
I think it is I. Division
No. Study this site and memorize PEMDAS.
http://www.mathsisfun.com/operation-order-pemdas.html
http://www.mathsisfun.com/operation-order-pemdas.html
Oh okay so its multiplication?
Yes.
Don't forget PEMDAS!
Don't forget PEMDAS!
Thank you.
You are welcome.
I would subtract first to eliminate y
65 y is in both
65 y is in both
Oops! Thanks, Damon. You're right. I goofed.
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
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
1 answer