Need fast!
ellason wants to solve the following system using the elimination method:
5x + 2y = 30
x + y = 8
what number should the equation x + y = 8 be multiplied by to eliminate y? (4 points)
2
–2
5
–5

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected