Algebra Tutorials!

 Friday 20th of September

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 Depdendent Variable

 Number of equations to solve: 23456789
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 Dependent Variable

 Number of inequalities to solve: 23456789
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# Evaluating Expressions and Solving Equations

## Evaluating Expressions

 Background To evaluate a variable expression, substitute a number for each variable. Then find the value of the numerical expression. Warm-Up If x = -6 then 6x = ? matches -36. â€œ6 times -6 is -36.â€

## Solving Equations

 BackgroundTo solve an equation, use inverse operations. Whatever operation is done to one side of the equation must be done to the other side to make an equivalent equation. If a = b, then a + c = b + c. If a = b, then a - c = b - c. If a = b, then ac = bc. If a = b, and c ≠ 0, then a / c = b / c. Warm-Upn - 8 = 12  matches n = 20. â€œIf you add 8 to both sides, then n = 20.â€ Warm-Up 2n + 3 = 15 matches n = 6. â€œFirst subtract 3 from each side to get 2n = 12. Then divide both sides by 2 to get n = 6.â€