Find the equation of the line y=3x−5y = 3x - 5y=3x−5 after it is reflected across the line y=xy = xy=x.
y = \frac{1}{3}x + \frac{5}{3}
y = \frac{1}{3}x + 5
y = 3x + 5
y = -\frac{1}{3}x - \frac{5}{3}