Question

y=x+5
x=5y+2
What if the first step in solving this equation with substitution?
y = 5y + 2
y = (5y + 2) +5
x + 5 = 5y + 2
None

Answer 1

I take the second equation x=5y+2
and substitute x in the first one:
means instead of 
y = x + 5
y = (5y+2) + 5

I think you have to choose second answer