Martin is 6 years younger than his sister. the sum of their ages is no more than 22 years. use x represents martin's sister's age.

Martins sisters age is 14 I got this My work (could be wrong)

Its pretty simple if they said Their sum of their ages is 22 all you have to do is 22-6= 14.  

Hope this helps If you have any questions ask me in the comments :D

Martin's sister's age (x) = Martin's age (y)+6

Step-by-step explanation:

Solving it a with little more algebra

Martin: y

Martin's sister: x

x+y ≤ 22

y=x-6

x+x-6 ≤ 22

2x-6=22 or 2x -6 <22

Let's start with the highest sum: 22

2x-6=22

2x-6+6=22+6

2x=28

x=14

If x=14 (Martin's sister's age) then Martin's age (y) is 8 years old

But also, other ages satisfy this condition (no more than 22)  x+y ≤ 22

x=13, y= 7 | x+y ≤ 22

x= 12 y=6 | x+y ≤ 22 (...)

Martin's sister's age (x) = Martin's age (y)+6 years