Final answer:
The slope of the line represented by the equation y = -13x is -13. It is the coefficient of the x variable in the equation.
Step-by-step explanation:
The subject of this question is Mathematics, specifically dealing with the concept of the slope of a straight line in algebra. When given the equation of a line in the form of y = mx + b, where m represents the slope and b represents the y-intercept, one can determine the slope by looking at the coefficient of the x variable. For the line y = -13x, the slope is the coefficient of x, which is -13. This means that for every increase of 1 on the horizontal axis (x-axis), there is a decrease of 13 on the vertical axis (y-axis). The slope is negative, indicating that the line slants downwards as one moves from left to right.