To find the y-intercept of the function \( y = 2x - 6 \), you set \( x = 0 \) and solve for \( y \):
\[ y = 2(0) - 6 = -6 \]
Therefore, the y-intercept of the function is \( -6 \). This means the graph intersects the y-axis at the point \( (0, -6) \).