The equation of a line in slope-intercept form is given by:
\[ y = mx + b \]
where \( m \) is the slope and \( b \) is the y-intercept.
Given that the slope \( m = -\frac{3}{4} \) and the y-intercept \( b = 7 \), we can substitute these values into the equation:
\[ y = -\frac{3}{4}x + 7 \]
So, the equation of the line is:
\[ y = -\frac{3}{4}x + 7 \]