F(x)=2x+1,g(x)=X2-2x-4

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Can any one me with the answers to these questions asap?

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