human
Substitute a solution back into the remaining equation and find the second solution Nick has almost solved a pair of simultaneous equations.
He just needs to find the value of \( y \).
He writes down:
\[
3-y=5
\]

What is the correct value of \( y \) ? \( y=2 \)
gpt
When solving an equation where there is a negative sign in front of the variable at the final stage, believes they can ignore it and treat it as if it's positive