a) Suppose the farmer makes a profit of $45 per acre of celery and $50 per acre of lettuce. Write the profit function, determine how many acres of celery and lettuce he should plant to maximize profit, and state the maximum profi

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
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A farmer has 300 acres on which to plant two crops, celery and
lettuce. Each acre of celery costs $250 to plant and tend,
and each acre of lettuce costs $300 to plant and tend. The
farmer has $81,000 available to cover these costs.
a) Suppose the farmer makes a profit of $45 per acre of
celery and $50 per acre of lettuce. Write the profit
function, determine how many acres of celery and lettuce he should plant to maximize profit, and state the
maximum profit. (Hint: Since the graph of the profit
function is a plane, you will not need to check the
interior for possible critical points.)
b) Suppose the farmer’s profit function is instead P(x, y) = - x2 - y2 + 600y- 75,000. Assuming the same constraints, how many acres of celery and
lettuce should he plant to maximize profit, and what
is that maximum profit?

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