Complete the two-column proof.
Given: RST = 5x degrees and UVW =7x degrees
RST and UVW are supplementary
Prove: x=15
Statements
1. 5x +7x =180
2. 12x =180
3. X=15
A. _______
B. _______
C. _______
A. Angle RST and angle UVW are supplementary
B. 5x + 7x = 180
C. 12x = 180
D. Divide both sides of the equation by 12: x = 15