Answer:
look at the picture I have sent
Answer:

Let's start by breaking down the problem.
This is how it should look. ↓
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What does that <em>x</em> mean? <em>x</em> is just a substituted value for the first 2 equations.
Now, we can solve.
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Add 3

Now, multiply 6 times 5 squared. What does 5 squared mean? 5 squared is just 5 times itself once. You most likely want to solve 5 squared before multiplying.

And now for the last step, multiply 25 times 6

With that information, the problem is solved! Your answer is 150
You can conclude that AE = DE because the triangles are about equal
The constant of proportionality is equal to k in y=kx. In y=10x, the k value is 10.
Final answer: C. 10