Question 349644
BY DEFINITION THE SUM OF COMPLEMENTARY ANGLES IS 90 DEGREES!
{{{C[1]+C[2]=90}}} 
PROBLEM STATES! {{{C[2]}}} IS {{{(1/2)*C[1] - 3}}}
SUBSITUTE
{{{C[1]+((1/2)*C[1]-3) =90}}}
COMBINE
{{{(3/2)*C[1]-3 =90}}}
SOLVE:
multiply EACH SIDE OF EQUATION by (2/3)
{{{C[1] -2 =60}}}
{{{C[1]=62}}}
FIND C[2] = (1/2)*C[1]-3)!!!
{{{C[2]=28}}} 
CHECK YOUR ANSWERS!! 62 +28 = 90