SOLUTION: John is n years old. John And Julie ages add up to 40. Julie is 4 years older then John. Write and equation for this situation

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Question 869005: John is n years old.
John And Julie ages add up to 40.
Julie is 4 years older then John.
Write and equation for this situation

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
N%2BJ=40
J=N%2B4
Then substitute into the first equation.
N%2B%28N%2B4%29=40
2N=36
N=18
J=18%2B4
J=22