Final answer:
The equation of the line with a slope of -2 and a y-intercept of (0, 3) is y = -2x + 3.
Step-by-step explanation:
To complete the equation of the line, we can use the slope-intercept form of a linear equation.
The slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.
In this case, the slope is -2 and the y-intercept is (0, 3).
Therefore, the equation of the line is y = -2x + 3.