Brainlag PlusCollect every term with the new subject on one side, factorise it out, then divide.
Collect, factorise, divide
When the subject appears twice, you cannot just undo the operations.
Get every term with it on one side, the rest on the other, then factorise.
- make x the subject of y(x + 2) = 3x − 1
- xy + 2y = 3x − 1
- 2y + 1 = 3x − xy
- 2y + 1 = x(3 − y)
- x = (2y + 1)/(3 − y)
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 2, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards