given: ∠a and ∠b are supplementary angles.

m∠a=4x-16 ; m∠b=2x+4

prove: m∠b=68°

drag and drop reasons into the boxes to correctly complete the proof. fill in the blanks.

statement: reason:
4x-16+2x+4=180

6x=192

x=32

options:
(substitution property of equality, reflective property of equality, addition property of equality, division property of equality, symmetric property of equality, transitive property of equality, angle addition postulate)

see attachment for picture of question