Geometry Proof - please help ASAP

Question

Given:

Angle 1 and angle 2 are supplementary.

Angle 3 and angle 4 are supplementary.

Angle 1 is congruent to angle 3.

Prove: Angle 2 is congruent to angle 4.

Answer 1

angle 1 and angle 2 are supplementary_____Given

angle 3 and angle 4 are supplementary_____Given

angle 3 ≅ angle 4______________________Given

m(angle 3) = m(angle 4)________________Definition of congruent angles

m(angle 1) + m(angle 2) = m(angle 3) + m(angle 4)______Definition of supplementary angles

m(angle 3) + m(angle 2) = m(angle 3) + m(angle 4)______Substitution

m(angle 2) = m(angle 4)____________________________Subtraction property of equality

angle 2 ≅ angle 4_________________________________Definition of congruence