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Combining Like Terms Variable A symbol which represents an unknown. Examples: x m z y Expression v. Equation Expression: Numbers, symbols, and operators grouped together that show the value of something. For example: 3x – 5 Equation: A Statement formed when a equality symbol is placed between two equal expressions. For example: y = 3x – 5 *Make sure to leave the right form on any assessment* Algebra Tiles *These tiles are positive side up ( The red side is always negative)* 1 1 x x x2 x 5 y Unit Tile x Tile 5 Piece x y y2 x 1 1 y x2 Tile y Tile xy y y 1 xy Tile y2 Tile Jumbled Piles x x x2 x2 y x y y x y x2 x 2 y x x x x 2 x 2 3 y 2 x 1 2 2 y x2 2 x y y y Zero Pair Jumbled Piles x2 x x x x x Zero Pair x 3x 4 y 3 2 Zero Pair Combining like Terms Terms: Variable expressions separated by a plus or minus sign. Like terms: Terms with the same variable(s) raised to the same power. Combine Like Terms: Add the the numbers the liked terms are being multiplied by. Ex: Simplify the expression below: The x2 Tile The x Tile 2 2 x+6 x + 5 + 2x x + 3x x + 4x 6x 2 8x + 7x + 11 6+2 4+3 5+6 Unit Tiles Different Meanings What does the symbol below mean? Find as many ways to describe the symbol. Three different meanings: Negative Subtraction Opposite The Opposite Rewrite the following expression: 4 2x The opposite of… x x 4 2x