What is mean by infinity in maths

How can you tell when x and y are not directly proportional?

2/3(-6y+9x) expand each expression using the distributive property

Astrid spent $36 on new shoes. this was $12 less than twice what she spent on a new skirt. part a: which equation would solve for how much she spent on the skirt? part b: solve the equation in the workspace provided below. how much did astrid spend on her skirt?