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Question:
In January of the year 2000, I was one more than eleven times as old as my son William. In January of 2009, I was seven more than three times as old as him. How old was my son in January of 2000?
Deadline
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Answers : 3
Cos your son was 3 years old in January of 2000
Ok, we can consider William's age as an
, and the age of the father as 
, then taking into account the data of the problem, we expreed it mathematically as:
It is understood then that we have an equation system with two unknowns, of which we want to know the value of X, so to solve it we will use the Crámer rule for determinant (Spanish version). We proceed to rewrite the system and identify the coefficients:
For x, by the method of determinate we have:
solved with pleasure by @juancmz
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Going to say your son was 3 years old 😀
Ans: 3 years old
3 years
the answer is 3yrs old