m is usually slope
lets analyze this problem
its a linear line, meaning a straight line
i see that y, the output, increases by 4 every time x goes up 2
slope, or m, is equal to the rise/run
rise is 4, run is 2
4/2 = 2
m = 2
this means that for every x, y goes up 2
or, for every 2 x, y goes up 4
hope this helps :)