Complimentary angles add to equal 90°. Write two equations to solve for two variable. J + K = 90 J = K - 18
use substitution or elimination to solve I will use substitution. substitute (K - 18) for J in the first equation to combine equations into one in only variable K.
(K - 18) + K = 90 2K - 18 = 90 2K = 90 + 18 2K = 108 K = 108/2 K = 54°
