3 x + 5 = 17 need help

Which ratio is equivalent to 10: 85

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

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.