Which of the following statements describes a correct method for solving the equation below?
15 + 3x = 15

a.
subtract 15 from both sides of the equation, and then divide both sides by 3.
b.
divide both sides of the equation by 3, and then add 15 to both sides.
c.
divide both sides of the equation by 3, and then subtract 25 from both sides.
d.
add 15 to both sides of the equation, and then divide both sides by 3.

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality