SOLUTION: amy is 3 years older than kevin. the sum of their ages is 39. how old is kevin?

Question 937699: amy is 3 years older than kevin. the sum of their ages is 39. how old is kevin?

Found 2 solutions by TimothyLamb, josmiceli:
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amy age
y = kevin age
---
x = y + 3
x + y = 39
---
put the system of linear equations into standard form
---
x - y = 3
x + y = 39
---
copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
solution:
x = 21
y = 18
---
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Amy's age now
Let = Kevin's age now
(1)
(2)
------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
Kevin is 18
check:
(1)
(1)
and
(2)
(2)
OK

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