To find the unit rate for the T-shirts:
you divide the $150 by the number of T-shirts.
150/50 = 3
50/50 = 1
Therefore, one T-shirt = $3
Do the same with the rest:
$3/shirt
$4.43/video game
6 tablespoons of sugar/glass of cocoa cola
Hope that helps!
P.S. I don't know what you mean when you say to write an equation but hopefully you can still figure it out!