a.) He takes down 3 bricks each minute, and it takes him 55 minutes to tear down the wall.
x = number of minutes
y = total number of bricks
3x = y
Plug in 55 for x because that is how long it took him to finish tearing down the wall
3(55) = y
165 = y
There were 165 bricks originally in the wall
b.) Your equation is 3x = y
For the table you could put whatever x values you want, I am not sure if your teacher prefers if they go in a pattern (5, 10, 15, 20 or 10, 20, 30, 40) or if they could be random inputs (10, 20, 30, 40, 50, 55) but once you choose your x inputs, you plug it into the equation to find "y"
You can go by 5's: 0,5,10,15,20,25, all the way up to 55 (which will need 3 more boxes, again idk if your teacher will mind)
For graphing, you could do for every 2 units(squares) you can go by 10's for the x-axis. And for the y-axis, for every 2 units(squares) you can go by 20's.