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prealgebra senior

Problem

Kymbrea's comic book collection currently has comic books in it, and she is adding to her collection at the rate of comic books per month. LaShawn's collection currently has comic books in it, and he is adding to his collection at the rate of comic books per month. After how many months will LaShawn's collection have twice as many comic books as Kymbrea's?
(A)
(B)
(C)
(D)
(E)
Solution
Kymbrea has comic books initially and every month, she adds two. This can be represented as where x is the number of months elapsed. LaShawn's collection, similarly, is . To find when LaShawn will have twice the number of comic books as Kymbrea, we solve for x with the equation and get .
Final answer
E