Math and Graphing Review Solving Linear Equations Pre-test Question

In this math review, you are asked to solve a set of linear equations for two unknown variables. You may be familiar with linear equations being expressed in terms of the variables and , but economist often use linear equations to describe the relationship between price and quantity which are expressed as and . The way you solve for the unknown variables is the same no matter what variables are used.

Use the following set of linear equations to solve for the value of .

=700100 =200+150

Q=

1). 500

2). 100

3). 50

4). 250