Answer:
5) x = 9
7) x = 7
Explanation:
5)
x - 2 + x - 1 = 15
2x -3 = 15
2x = 15 + 3
2x = 18
x = 9
7)
Find the length of BC
BC = 3x - 4 - 10
BC = 3x - 14
if AB = 1 and BC = 3x - 14 and AC = x + 1
1 + 3x - 14 = x + 1
3x - 13 = x + 1
3x - x = 1 + 13
2x = 14
x = 7