Here is a problem I don't quite know what to do with.

Solve the system of equations.

should I just solve for z by isolating it on one side of the equation like I would normally or is there a better method?

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- February 18th 2010, 08:42 AMMathBlaster47Systems of equations.
Here is a problem I don't quite know what to do with.

Solve the system of equations.

should I just solve for z by isolating it on one side of the equation like I would normally or is there a better method? - February 18th 2010, 09:04 AMPulock2009
- February 18th 2010, 09:33 AMmasters
Hi MathBlaster47,

There are several ways to solve a system like this, but your way seems to be a good start.

(1)

(2)

(3)

Solve (2) for z:

Substitute this for y in (1) and (3).

(1)

(3)

Solve these two equations for x and y by using substitution or elimination method. Then, substitute your value for y into (2) to find z.

(1)

(3)

Multiply (1) by 5. Multiply (2) by 3.

(1)

(3)

Add (1) + (3).

I'll leave the rest for you. Good luck.