this problem is confusing to me. 3x-6y=5. The answer I get is 31/9 and it doesn't seem right.

Printable View

- Apr 17th 2005, 06:28 AMvjohnson[SOLVED] solving equations
this problem is confusing to me. 3x-6y=5. The answer I get is 31/9 and it doesn't seem right.

- Apr 17th 2005, 08:59 AMMatrix
3x-6y=5

3x=5+6y

x=5+6y/3

x=5/3+2y

3(5/3+2y)-6y=5

5+6y-6y=5

there for y can be any number except 0 - Apr 17th 2005, 09:09 AMpaultwang
Please indicate which variable is the unknown (what are you solving for?). If x and y are both unknown, you have insufficient number of equations to fully solve this system.

Without subjecting the system to conditions, x and y can be any logical objects - real scalars, complex scalars, matrices, vectors, etc... - Apr 17th 2005, 09:09 AMMathGuru
vjohnson,

In order to solve an equation with*x*number of variables you need*x*number of equations. You have**one**equation with**two**variables which means we cannot solve both x and y.

What are you trying to solve for and what if any information were you given besides the equation?