Answer:
BC = 60
Step-by-step explanation:
We can model the line with the expression
AB + BC = AC Sub each equation
8x + 9 + 6x + 6 = 141 Combine like terms
14x + 15 = 141 Subtract 15
14x = 126 Divide by 14
x = 9
Now we can use x to find BC
BC = 6x + 6
BC = 6(9) + 6
BC = 54 + 6
BC = 60
