which method do i use to solve: elimination or substitution

Algebra
Tutor: None Selected Time limit: 1 Day

x=12y-7

12y-x=12

Oct 5th, 2014

x=12y-7

12y-x=12

Substitution

12y -(12y-7) = 12

12y-12y+7=12

               7=12 impossible

This system is equivalent to:

x=12y-7  ------> x-12y=-7

x=12y-12  -----> x-12y=-12

There is no solution.

Oct 5th, 2014

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