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in this video were going to cover how to do questions like these where you have to rearrange formulas to get a particular letter by itself to do these questions you do basically the same thing as when you solve equations so you just rearrange the formula until you get the letter that youve been asked to find all by itself in this first question on the left theyre asking us to make x the subject so we need to end up with just an x on the left hand side equals something on the right to do this we first of all want to get the x by itself by getting rid of this 4 and this 3. so to get rid of the 4 we take our equation and just subtract 4 from both sides giving us y minus 4 equals 3x and to get rid of the 3 we just divide both sides by 3 but importantly its the whole of the y minus 4 that were dividing by 3 and that will equal a single x the more common way to write this though is to show the division using a fraction line with a 3 on the bottom which still means divided by 3 but this
