Question

Which of the following situations MAY cause someone to use substitution, in order to solve a system of equations?

A. An exact solution is not needed.
B. One of the equations may easily be solved for a variable.
C. An exact solution is needed.
D. Both of the equations are solved for one variable.

Answer 1

If you want to substitute, you need to solve an equation for a variable. I ONLY use this method if I can easily solve one equation for a variable, and then it is a maybe. For this case use B