identifying+linear+function

=​5-1 identifying linear functions=

how do you tell if something is a linear function?
{(0,5),(-2,3),-4,1),(-6,-1),(-8,-3)} {(2,-2),(-1,0),(-4,1),(-7,3),(-10,6)} || y=4x+2 ||
 * friends: Ms.Gordon,parallel lines, graphs,tables,coordinate planes ||
 * intrest:finding range,finding cost, seeing how much gas cost,and finding the average ||
 * ===which pairs are linear funtions? ===
 * tell if the equation is linear and put it in standurd form(if needed).then find values of A"B"C"
 * soultion!!!!!!!!!!!!!!!!!!!​ ||