Step-by-step explanation:
I haven't used distance formula or Pythagoras theorem, not sure why that's given at the bottom of your question. check the image. that is how I solved it
Answer:

Step-by-step explanation:
start by squaring both sides:

squaring a square root cancels it out:

solve for x by first adding 8 to both sides:

then divide both sides by 3:

Answer: -50
Step-by-step explanation: (5-10) then multiply the answer by 10
Both are correct they just chose a different variable to solve for first. they will both get correct answers if they do the rest correctly.