Final answer:
The y-intercept in the linear equation y=-x-1 is -1, which is the y-coordinate where the line crosses the y-axis, corresponding to answer choice d.
Step-by-step explanation:
The y-intercept of a linear equation such as y=-x-1 is the y-coordinate of the point where the line crosses the y-axis. In the given equation, the y-intercept is represented by the constant term when the equation is in the slope-intercept form y = mx + b, where m represents the slope and b represents the y-intercept. Since the equation can also be written as y = -1x - 1, we can see that the coefficient of x is -1, which is the slope, and the constant term is -1, which is the y-intercept.
Therefore, the correct answer is d. -1, representing the point (0, -1), which is where the line intersects the y-axis.