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Purplemath‘s algebra lessons are informal in their tone, and are written with the struggling student in mind. Don’t worry about overly-professorial or confusing language! These math lessons emphasize the …
Purplemath “Linear” equations are equations with just a plain old variable like “x”, rather than something more complicated like x 2, or x / y, or square roots, or other more-complicated expressions.Linear equations are the simplest equations that you’ll deal with. You’ve probably already solved linear equations; you just didn’t know it.
Purplemath In the previous two pages, we’ve looked at solving one-step linear equations; that is, equations that require one addition or subtraction, or that require one multiplication or division. However, most linear equations require more than one step in order to find their solution.
Purplemath. Moving on from the simplest radical equations, we encounter equations in which the radical is not isolated. Sometimes, all we’ll need to do is move a constant; other times, the solution will get rather messy. Solve:
Purplemath. Sometimes we are given a formula, such as something from geometry, and we need to solve for some variable other than the “standard” one.For instance, the formula for the perimeter P of a square with sides of length s is P = 4s.We might need to solve this equation for s because we have a lot of squares’ perimeters, and we want to plug those perimeter values into …
Purplemath. In this lesson, we’ll first practice solving linear equations which contain parentheticals. Solving these will involve multiplying through and simplifying, before doing the actual solution process. If you’re not comfortable with parentheses, study up …
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