Julie is selling candy bars to raise money for new band uniforms. candy bar x sells for $2 and candy bar y sells for $3. the number of y candy bars julia sells must be greater than or equal to three times the number of x candy bars she sells. she has at most 36 candy bars to sell. what is the maximum revenue she can make?

In this question, you are asked how much the maximum revenue. Since candy Y sold for a higher price than candy X, that means you have to sell candy Y as much as possible.
The number of candy Y must be >= 3 times candy X. Since this won't limit candy Y selling, then you can convert all 36 candy into candy Y and 0 candy X

36 candy (Y) >= 0 candy(X) > the requirement is met.

The revenue would be 36 candy Y * $3/candy Y= $108

Ithink if im not mistaking b is -3 but im not a 100% sude