James is two years younger than twice his sister Kate’s Age. Together their ages add up to 19. What is each of their ages?

Answer 1

j = 2k-2
j+k = 19
now just crank it out

Answer 2

Kate is X yrs. old.
James 2x-2 yrs. old.

x + (2x-2) = 19.
X = 7.
2z-2 = ?