when rearranging the equation 6y = 9 - 3x to make x the subject, am i right in thinking to add 3x to both sides (6y + 3x = 9), then subtract 6y on both sides(3x = 9 - 6y then divide both by 3(x = 9 - 6y/3)?

You have it.

x=3-2y

Actually, you made a small mistake. Let's go through the steps again to rearrange the equation 6y = 9 - 3x to make x the subject correctly.

Step 1: To isolate the term with x, first, we want to get rid of the -3x on the right side of the equation. To do this, we need to add 3x to both sides of the equation:

6y + 3x = 9

Step 2: Now, we want to isolate the x term completely. To do this, we need to subtract 6y from both sides of the equation:

3x = 9 - 6y

Step 3: Finally, we can solve for x by dividing both sides of the equation by 3:

x = (9 - 6y)/3

So, the correct rearranged equation is x = (9 - 6y)/3.