Answer: Undefined.
Step-by-step explanation: There is only two equations to represent this question. Since we are trying to get Ishaan's age, we have to know Ben's age in order to know his age. However, Ben's age is represented by Ben=4x+6, we don't know his age exactly, therefore we can't determine Ishaan's age. Ishaan's equation would be Ishaan= age-6 divided by 4. Therefore, there is little to no information to determine his real age.