What is the value of x in the situation-2/9x=2/5?

Find the x-intercept and y-intercept of the line. 3x + 5y = −15

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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