Can someone please help me with this? I'm taking my semester exam and my last 2 brain cells are moving a bit slow.

How can you tell when x and y are not directly proportional?

X+ y = 5 ; x - y =3 solve using linear combination

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given