Because the angles are congruent, the two legs are congruent.
8x-4= 5x + 11
Add 4 to both sides.
8x=5x + 15
Subtract 5x on both sides.
3x=15
Divide 3 on both sides.
x=5br />
Enter 5 into BC.
4x-2 />
4(5)-2
20-2= 18 />
18 is the answer.
I hope this helps!
~kaikers