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how many lines of symmetry does this figure have?

a) 0

b) 1

c) 2

d) 3

W has 1 line of symmetry- right down the middle. Nowhere else on the figure can it be reflected into symmetry.

Answer

Both are correct.

Explanation
The both equations are the same.
When we say that y=x+10, we can make x the subject of the formula and get;
y=x+10
y-10=x
x=y-10.

If the substitution is done correctly, that is x+10 for y and y-10 for x in the other equation then, both would be correct.