Please help find the mistake-Will give Brainliest

Answer:
Sorry - mod deleted a good ans provided by previous helper
ans is the third option down
Step-by-step explanation:
mistake is at
5x-10=10
instead of 5x=10, the next step should be ADDING 10 to both left n right
5x-10+10=10+10
5x=20
solving
x=4
y=5-2x=5-8
=-3
Answer:
The answer is C
Step-by-step explanation:
In 5x - 10 = 10
Because this is subtraction, you do the inverse operation
Addition
So -10 + 10 = 0 While 10+10=20
Because this one part is wrong, the rest of the problem is wrong
Hope this helps
-GoldenWolfX