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pychu [463]
2 years ago
7

Twice a number (z) added to 21 is equal to 9 times the number added to 7. What is the number?

Mathematics
1 answer:
pickupchik [31]2 years ago
5 0

Answer:

The number is  2

Step-by-step explanation:

Twice a number (z) = 2*z = 2z

Twice a number (z) added to 21  = 2z + 21

9 times the number added to 7 = 9z + 7

9z + 7 = 2z + 21

Subtract 2z form both sides

9z - 2z + 7 = 21

       7z + 7 = 21

Subtract 7 from both sides

7z = 21 - 7

 7z = 14

Divide both sides by 7

z = 14/7

z = 2

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