Answer: S = 3.5
Explanation:
We know that congruent means that the sides are equal. Knowing this, we can make an equation to solve for.
We can 2s+11=8s-10.
We can then subtract 2s from both sides, getting 11=6s-10.
We can then add 10 to both sides, getting 21=6s.
Dividing both sides by 6, we get 3.5=S.