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03-06-2020
Mathematics

contestada

4) The sum of two numbers is 39. Their
difference is 21. What are the two numbers?

Respuesta :

03-06-2020

Answer:

30 and 9

Step-by-step explanation:

x+y=39 , x-y=21

Solve for x:

x+y=39 , x-y=21

x= 30

Substitute x with 30:

(30)+y=39 , (30)-y=21

Solve for y:

y=9

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