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Variables and Like Terms

Variables and Like Terms. Section 2-2-1. Variables. A variable holds a place for a number. Any letter can be used. x+6 3-7y 2t-3s+6r 2. Expressions. Does not contain and equal sign A combination of variables, numbers and operations An EQUATION is made of expressions. Equations.

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Variables and Like Terms

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  1. Variables and Like Terms Section 2-2-1

  2. Variables • A variable holds a place for a number. • Any letter can be used. • x+6 • 3-7y • 2t-3s+6r2

  3. Expressions • Does not contain and equal sign • A combination of variables, numbers and operations • An EQUATION is made of expressions

  4. Equations • An equation contains an equal sign • It is made of expressions • 2x-6 = 5x+2 has an expression on each side of the equation.

  5. Term • A term is part of an expression that is added or subtracted. • In 3x2 + 4x +3 3x2, 4x and 3 are the terms. • Three parts • Variable • Exponent -The power to which the variable is raised • Coefficient – The number in front of the variable.

  6. Terms • Identify the coefficient, exponent and variable for the following terms. • 7x3 • -8x2 • 2x • -3x2 • 7x • x5

  7. Like Terms • For terms to be “like terms” everything must match except the coefficients. • Which of the following are like terms?

  8. Like terms • Like terms can be added or subtracted. • 3x + 5x • 8y2s – 3y2s • What about m3-x3-7m3

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