For which system of equations would elimination be the simplest technique to choose?
A. y = 2x and x + 3y = 5
B. 4x + 3y = 6 and 3y = 5
C. x + y = 7 and x - y = 12
D. 3x - 2y = 8 and 4x - 5y = 20

Question

For which system of equations would elimination be the simplest technique to choose?
	A.	y = 2x and x + 3y = 5
	B.	4x + 3y = 6 and 3y = 5
	C.	x + y = 7 and x - y = 12
	D.	3x - 2y = 8 and 4x - 5y = 20

aroub · Answer

C.	x + y = 7 and x - y = 12

parthkohli · Answer

The third one because you can easily subtract both equations.

parthkohli · Answer

Or I'd say add.

anonymous · Answer

Aren't you suppose to explain rather than give answers?

anonymous · Answer

Yes guys, please explain.

parthkohli · Answer

I did, didn't I?

aroub · Answer

Yeah, sorry. Parth did though.

parthkohli · Answer

In the third one, you see, that you can eliminate y by adding equation {1} and {2}. Then you can solve for x.

anonymous · Answer

I meant that for Aroub, sorry Parth.

parthkohli · Answer

When solved for x, then you can substitute it back to the equation, and then solve for y.

parthkohli · Answer

You should use the method of elimination when you have the same variable with the same numerical coefficient.

anonymous · Answer

C.	x + y = 7 and x - y = 12
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