Algebra 2 (again)
posted by True .
Find the value of y for which the equation below is true.
2x y + 7
x  = 7  3y
3, 3, 1, or 4

Multiply the second equation by 2 to get the system:
2x y + 7
2x = 14  6y
Equating the righthand side gives us the TWO equations:
2*(73*x)=(x+7)
which can be solved for x, and x=1
or
2*(73*x)=(x+7) which gives x=21/5.
Make an appropriate choice of the solutions. 
These are matrices.
I get y=1