Review: Solving One-Step Equations

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Presentation transcript:

Review: Solving One-Step Equations

Definitions Term: a number, variable or the product or quotient of a number and a variable. X 2w c 3

5 Terms are separated by addition (+) or subtraction (-) signs. 3a – 2/5b + 7x – 4z + 52 How many Terms do you see? 5

Constant: Coefficient: Definitions a term that is a number. the number value in front of a variable in a term.

3x – 6y + 18 = 0 What are your coefficients? What is your constant? 3 , -6 18

Solving one-step equations: A one-step equation means you only have to perform 1 mathematical operation to solve it. You can add, subtract, multiply or divide to solve a one-step equation.

Solving one-step equations: To undo an operation, use the OPPOSITE OPERATION + – – + x ÷ ÷ x

Solving an addition equation: t + 7 = 21 Example 1 Solving an addition equation: t + 7 = 21 Get rid of the 7 by subtracting 7 from both sides of the equation. -7 -7 t = 14

Solving a subtraction equation: g – 6 = 40 Example 2 Solving a subtraction equation: g – 6 = 40 Get rid of the 6 by adding its opposite to both sides of the equation. +6 +6 g = 46

Solving a multiplication equation: 8n = 32 Example 3 Solving a multiplication equation: 8n = 32 Get rid of the 8 by dividing both sides of the equation by 8. Here we “undo” multiplication by doing the opposite – division. 8n = 32 8 8 n = 4

Solving a division equation: k / 9 = 11 Example 4 Solving a division equation: k / 9 = 11 Get rid of the 9 by multiplying both sides of the equation by 9. Here we “undo” division by doing the opposite – multiplication. x 9 x 9 k = 99

Video Tutors One Step Equations by /Adding: http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-013s.html One Step Equations by Subtracting: http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-012s.html One Step Equations by Multiplication: http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-015s.html One Step Equations by Division: http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-014s.html