To change the equation \(-x + y = 5\) to standard form, we typically want it in the form \(Ax + By = C\), where \(A\), \(B\), and \(C\) are integers, and \(A\) is non-negative.
The given equation is:
\[ -x + y = 5 \]
To put it in standard form, we can multiply all terms by \(-1\) to make the coefficient of \(x\) positive. This gives us:
\[ x - y = -5 \]
Now it's in the form \(Ax + By = C\), where \(A = 1\), \(B = -1\), and \(C = -5\).
Therefore, the correct step to take is:
Multiply all terms by -1.