''Pick any two pairs of equations from the system. Eliminate the same variable from each pair using the Addition/Subtraction method. Solve the system of the two new equations using the Addition/Subtraction method.''
Really depends upon the 3 equations. If you can find x in terms of y and z in one of the problems, then substitute this back into the other two equations, then solve the 2 equations and two unknowns. There are other elimination techniques but difficult to explain. Or use the matrix solution technique in the TI calculator and use "rrde" to solve.
