Can someone help me?

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

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

Write the factored form of this trinomial 9x^2+18x-7