The cost, y, for x pounds of nails can be represented by the equation y=3.20x. What is the constant of proportionality of the equation?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Peyton's field hockey team wins 4 games out of every 7 games played. her team lost 9 games. how many games did peyton's team play?

Can someone me with my math problem pls my teacher is on my back about this