Y=-2x

To prepare for exams, it's important to understand the equation and its properties. The given equation is in the form y = mx, which represents a linear equation.

In this case, the equation y = -2x represents a straight line with a slope of -2. The slope represents the rate at which y changes with respect to x.

Some key points to remember about this equation are:

1. The slope is negative, indicating that the line decreases as x increases.
2. The line passes through the origin (0,0), because when x is 0, y is also 0.

To work with this equation, you can use it to find the value of y for different values of x, or vice versa. You can also use it to graph the line and determine its properties, such as the y-intercept and x-intercept.

If you need further assistance or have specific questions related to the equation, feel free to ask!