Answer:
C
Step-by-step explanation:
The formula for slope is y=mx+b. y=-6x^2 does not have the b variable, the y-intercept, though the other one does. The y-intercept is the point where the line intersects the y-axis. So, if y=-6x^2 has an intercept at the origin, then y=-6x^2-4 has the same slope, but is positioned 4 units down.