SOLUTION: How do I know that my solution to the equation makes sense? Equation: (3I-20)+I=500 Solution: I=130

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Question 747697: How do I know that my solution to the equation makes sense?
Equation: (3I-20)+I=500
Solution: I=130
Found 2 solutions by mikeebsc, tommyt3rd:
Answer by mikeebsc(26) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute the number 130 wherever you see the variable I.
(3(130)-20)+130=500
390-20+130=500
370+130=500
500=500
You got it!!
Good job and Good luck,
Mike

Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
We can check the correctness of a solution by testing it in the original equation. If the resulting calculation proves to be true, then our solution is correct.

%0D%0A%283I-20%29%2BI=500%0D%0A
%0D%0A%283%28130%29-20%29%2B%28130%29=500%0D%0A
%0D%0A%28390-20%29%2B%28130%29=500%0D%0A
%0D%0A370%2B130=500%0D%0A
which is true, so our solution is correct

:)