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
I think it is I. Division
No. Study this site and memorize PEMDAS.
http://www.mathsisfun.com/operation-order-pemdas.html
Oh okay so its multiplication?
Yes.
Don't forget PEMDAS!
Thank you.
You are welcome.
I would subtract first to eliminate y
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
To solve the given system of equations by elimination, the first step would be to subtract one equation from the other to eliminate one of the variables.
In this case, the system of equations is:
234x + 65y = 219 ...(Equation 1)
1225x + 65y = 427 ...(Equation 2)
To eliminate the variable 'y', we can subtract Equation 1 from Equation 2 or vice versa. The subtraction eliminates the 'y' variable because the y-coefficients in both equations are the same.
So, the correct answer is option G. subtraction.