L Least common denominator (LCD) The least common denominator (LCD) of two or more fractions is the smallest number that can be divided without remainder by each fraction's denominator. The LCD of is 12. The LCD of is 30. Legs of a right triangle The two shortest sides of a right triangle. Length of a rectangle Each of the longer sides of a rectangle. Less than or equal to symbol The symbol. Less than symbol The is read " 2 is less than 8." Like radicals Radicals that have the same index and radicand. Like square roots Square roots having the same radicand. Like terms Like terms have identical variables with identical exponents. -5x and 3x are like terms. -7xyz and -12xyz are like terms. Line segment A portion of a straight line that has a beginning and an end. Linear equation A mathematical equation such as 3x + 7 = 5x - 2 or 5x + 7y = 9, in which each variable has an exponent of 1. Linear equation in two variables An equation of the form Ax + By = C, where A, B, and C are real numbers. The graph of a linear equation in two variables is a straight line. Linear function A function of the form ƒ(x) = ax + b. Linear inequality A statement in which each variable has an exponent of 1 and no variables are in the denominator. Some examples of linear inequalities are Line of symmetry of a parabola A line that can be drawn through a parabola such that, if the graph were folded on this line, the two halves of the curve would correspond exactly. The line of symmetry through the parabola formed by . The line of symmetry of a parabola always passes through the vertex of the parabola. Liter The standard metric measurement of volume. 1 liter = 1000 milliliters. 1 liter = 0.001 kiloliter. Literal equation An equation that has other variables in it besides the variable for which we wish to solve. I = prt, 7x + 3y - 6z = 12, and P = 2w + 2l are examples of literal equations. Logarithm For a positive number x, the power to which the base b must be raised to produce x. That is, , where . A logarithm is an exponent. Logarithmic equation An equation that contains at least one equation.

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