Write a two-column proof.
Given: 7y = 8x – 14; y = 6
Prove: x = 7
Statements Reasons
1. 7y = 8x - 14 // Given
2. y = 6 // Given
3. 7(6) = 8x - 14 // Substitute 6 for y in statement 1
4. 42 = 8x - 14 // Simplify
5. 56 = 8x // Add 14 to both sides
6. x = 7 // Divide both sides by 8