I believe this means y=13
If you need an equation it is -3.4x=21.5
You simply divide both sides by -3.4 to get x=-6.32
if that's not right then just get on a calculator and calculate by doing what I said to divide
Answer:
x=5 feet
Step-by-step explanation:
At floor level y=0
If the expression is:

But, with the negative sign, the answer is x= 5i (where i is imaginary)