Variable Expressions

                    Lesson 1

Problem:                   Write the sentence as an equation.

A number decreased by four is twenty seven

Solution                    Let x represent the number.

Step 1: 

                                                            Solution                    X is decreased by four is represented by x - 4

Step 2:      

Solution                    The equation x-4 is equal to 27 is represented by x - 4 = 27

Step 3:     

Solution                    The answer is:  x - 4 = 27

Step 4:

Complete                                                    

                                                            Try two practice problems:  

                                                                                               Write each sentence as an equation.

                                                                         A. Thrice a number is seventy

B.Twelve less than a number is forty

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