For this case we have to:
x: Variable that represents Tyler's age
y: Variable that represents Tiffany's age
According to the data of the statement we can propose the following equations:
[tex]x = y + 4\\x + 10 = 2y[/tex]
To solve we substitute the first equation in the second equation:
[tex]y + 4 + 10 = 2y\\14 = 2y-y\\14 = y[/tex]
So, Tiffany is 14 years old.
Then Tyler has:
[tex]x = 14 + 4\\x = 18[/tex]
Tyler is 18 years old.
Answer:
Tyler: 18 years old
Tiffany: 14 years old
