Question 1198772
let x = freddy's age.
let y = his grandson's age.


you have an equation and an inequality.


the equation is x = 6y + 3


the inequality is x + y > 67


replace x with 6y + 3 in the inequality to get:
6y + 3 + y > 67
combine like terms to get:
7y + 3 > 67
subtract 3 from both sides of the inequality to get:
7y > 64
solve for y to get:
y > 64/7


that should be your solution.
you have to solve the equation and the inequality simultaneously.
the common solution is when y > 64/7.


when y > 64/7, x = 6y + 3 will be greater than 405/7 and x + y will be greater than 67.


the solution appears to be that y > 64/7.


the youngest freddy's grandson can be is some amount of age greater than 64/7 years.
it can not be 64/7 because then x = 6y + 3 would become x = 405/7 and 405/7 + 64/7 would be equal to 67 which is not allowed because x + y must be greater than 67.


y > 64/7 appears to be your solution.
that means that the grandson's age has to be greater than 64/7


it can also be shown as y > 9 + 1/7
it can also be shown as y > 9.142857143, depending on how many digits your calculator can display.


that's what i get.