Use an app called Socratic, take a photo of the questions you're stuck on, then it will help you in stages and show you the answer.
Answer: y = 90 x = 29
Step-by-step explanation:
A = nuts of $2/lb
B = nuts of $7/lb
let's say we'll mix "x" lbs of B to get a mixture with A of "y" lbs, therefore
Ummmmmmmmm that is a mixed number already