Final answer:
Legislatures and administrative agencies cannot directly amend the constitution. The formal process for amending the constitution requires action from both Congress and state legislatures.
Step-by-step explanation:
The constitution can be amended through a formal process outlined in Article V, which requires action from both Congress and state legislatures. To propose an amendment, two-thirds of both chambers of Congress must agree to the proposal, or two-thirds of the states may call a convention to propose an amendment. To ratify an amendment, three-fourths of the state legislatures must agree to adopt it.