Final answer:
The image of point L(-3,0) under dilation rule with a factor of 7 is (-21, 0).
Step-by-step explanation:
The dilation rule states that the image of a point L is obtained by multiplying its coordinates (x, y) by a factor of k.
In this case, k = 7.
So, to find the image of L(-3,0), we multiply each coordinate by 7: (-3*7, 0*7) = (-21, 0).
Therefore, the image of L is the point (-21, 0).