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

Question

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

anonymous · Answer

The first one is the simplest because you already have an expression for "y" defined.  That is, "y" is all by itself on the left side.

anonymous · Answer

thanks!

anonymous · Answer

When solving the first system, you can take that expression for "y" and put it directly into the second equation:

x + 3(2x) = 5

anonymous · Answer

You're welcome!  Good luck to you in all of your studies and thx for the recognition!  @EmmaH

anonymous · Answer

no problem!=)) you too!