A trampoline park sells half-day and full-day passes. The half day passes cost $12
$
12
per pass, while the full-day pass cost $20
$
20
per pass. The trampoline park needs to make at least $900
$
900
a day to stay in business. The manager of the park wrote the inequality 12x+20y≥900
12
x
+
20
y
≥
900
to determine the combination of half-day and full day passes they need to sell to stay in business.