the y-intercept is the point on the graph where it crosses the y-axis, and has coordinates (0, b). It is also the value of y when x = 0.
To find the y-intercept, set x = 0:
y = -3/4(0) - 4
y = 0 - 4
y = -4.
Therefore, the y-intercept is (0, -4), or -4.