The difference between 3 times a number and 21

The difference (-) between 3 times a number (3n) and 21.

3n - 21

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept

A. p = 2(l + w)p/2 - l = ww = p/2 - l b. while isolating the variable w in the equation, i first divided both sides by 2 and then i subtracted l from both sides. i hope this .