Answer:
Step-by-step explanation:
1). Given
2). DE = EF
3). Given and (2)
4). Subtraction Property of Equality (L.H.S. - 6x = R.H.S. - 6x)
5). 6 = 2x (5 + 1 = 2x - 1 + 1)
6). 3 = x (6 ÷ 2 = 2x ÷ 2)
8). Substitute x by its value
9). Q.E.D.
