A bakery makes cakes ($x$) and pastries ($y$). It must make at least as many cakes as pastries. Which constraint is this?

Explanation

1. 01

   Write each resource as (amount used per unit) × (number of units), added over the products.

2. 02

   'At most' or 'available' gives ≤, 'at least' or 'must give' gives ≥; a profit is maximised and a cost minimised.