The slope of the line represented by the equation y = 45x + 3 is 45.
In this equation, which is in the slope-intercept form (y = mx + b), the variable m represents the slope of the line. Here, m = 45, which means that for each increase of 1 unit in the x-direction, the value of y increases by 45 units.
This steep slope indicates that the line rises quickly as it moves from left to right. The term b, which is +3 in this case, is the y-intercept of the line, showing where the line crosses the y-axis.