Sam wants to leave an 18% tip for his dinner. The bill is for $23.50. Which equation could be used to find the total amount that Sam should pay?
23.5 = 0.18 x
x= (0.18)(23.5)
x= (23.5)(1.18)
1.18 = 23.5 x

Solve for x, y, and z. show all steps.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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