Walter wants to solve the given system of linear equations.
X+ 2y = 9
6x - y = 2
His method is to replace the second equation with an equivalent form so that he can eliminate one of the variables by adding the equations tog
rewrites the system of equations as follows:
x + 2y = 9
12x - 2y =
What number should go in the blank space, in order for this system of equations to produce the same solution as the original system?