We need a boy to join our zo0om preferably like 12-14 but irdc

Find the solution of system of equation y= x-4 y=4x+2

Whats the name of the vertical axis

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer