How do you write "three times a number, added to 9, is 39" as a mathematical equation?

1 Answer
Júlio B.
Jun 18, 2017

Three times a number added to #9# is #39#: #3x + 9 = 39#

Explanation:

Lets say that the number is #x#.
So, three times the number is three times #x#: #3x#.
Three times a number added to #9#: #3x + 9#.
Three times a number added to #9# is #39#: #3x + 9 = 39#

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