Linear equations

Linear equations are where algebra starts to feel like a puzzle with rules. Every one of them asks the same question: what number can x be so both sides stay equal? The trick is to undo what was done to x in reverse order, doing the same thing to both sides each time. Most lost marks here don't come from hard ideas. They come from small slips: dividing only one term, forgetting to hand a negative sign to every term inside a bracket, or mixing x terms with plain numbers. This topic walks through those slips in the order they usually show up. You start with isolating x in one step, move to two-step equations, then brackets, like terms and equations with x on both sides. It ends with inequalities, where one extra rule matters. Work through the pages in order, try the three practice questions on each, and check every answer by plugging it back into the original equation.