How do I solve a three-variable system of equations?

Answer by  cubedbee (155)

You need 3 equations to solve for 3 variables. First, pick one your equations, and solve for z in terms of x and y. Second, take the other two original equations, and substitute your solution from part one in for z. Simplify, and then solve like any 2-variable system.

Answer by  BL89 (13)

Express one variable in terms of other two variables from one equation, and substitute it in two other two equations to solve two-variable system of equation first.