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44

Step-by-step Answer
PAGE: 354SET: ExercisesPROBLEM: 44
Please look in your text book for this problem Statement

Substitution:

Given equations are,

----------(1)

------(2)

The first equation is already solved for y,

so,  substitute for y in the second equation.

                  (Second equation)

            (Substitute  )

                (Multiply: )

                        (Add: )

Apply division property of equality: If a = b then .

                    (Divide each side by 20)

                           (Cancel common terms)

                                            (Divide: )

Substitute for x in either equation to find y.

                             (first equation)

                          (Substitute  )

                              (Multiply: )

The solution is .

Check the solution:

To check, Substitute   and in either equation.

                                (first equation)

                           (Substitute  and )

                              (Multiply: )

The solution  is true.

If the system have only one solution, such as .

If the system have only one solution, such as .



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