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70

Step-by-step Answer
PAGE: 499SET: ExercisesPROBLEM: 70
Please look in your text book for this problem Statement

The equations are and .

Find .

                      (Second equation)

          (Subtract from each side)

                  (Apply additive inverse property: )

                  (Multiply each side negative sign)

Find .

                   (First equation)

     (Substitute )

           (Distributive property: )

                   (Combine like terms)

        (Add to each side)

                        (Apply additive inverse property: )

                   (Divide each side by )

                               (Cancel common terms)

Find .

                  (Substitute )

                       (Multiply)

                            (Simplify)

Add simplified and values.

Therefore, value is .

Option A is right choice.



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