**TI83F* AppVariable file 12/24/08, 18:29 GLA209nav 26CE319875DD4F1B9DFDCB650E5220B1GLA209.&GLA2091   asymptote?asymptote:A line that a graph approaches but never intersects. combined variation gcombined variation:When one quantity varies directly and/or inversely as two or moreother quantities. complex fractionjcomplex fraction:A rational expression whose numerator and/or denominator contains a rational expression. constant of variationGconstant of variation:The number k in an equation of the form y = kx. direct variationdirect variation:y varies directly as x if there is some nonzero constant k such that y = kx. k is called the constant of variation. horizontal asymptoteAhorizontal asymptote:A horizontal line which a graph approaches.  hyperbola [ !hyperbola:The set of all points in the plane such that the absolute value of the difference of the distances from two given points in the plane, called foci, is constant. inverse variationinverse variation:y varies inversely as x if there is some nonzero constant k such that xy = k or y = ((k)/(x)), where x  0 and y  0.  joint variationcjoint variation:y varies jointly as x and z if there is some nonzero constant k such that y = kxz.  oblique asymptote roblique asymptote:An asymptote that is neither horizontal nor vertical and is sometimes called a slant asymptote.  point discontinuity  !point discontinuity:If the original function is undefined for x = a but the related rational expression of the function in simplest form is defined for x = a, then there is a hole in the graph at x = a.  rational equationBrational equation:An equation that contains rational expressions.  rational expression[rational expression:An algebraic fraction whose numerator and denominator are polynomials. rational functionrational function:A function that contains rational expressions represented as the quotient of two polynomials in the form f(x) = (g(x))/(h(x)), where h(x)  0. rational inequalitySrational inequality:Any inequality that contains one or more rational expressions. reciprocal function Preciprocal function:Trigonometric functions that are reciprocals of each other. vertical asymptote vertical asymptote:If the related rational expression of a function is written in simplest form and is undefined for x = a, then x = a is a vertical asymptote. weighted average weighted average:A method for finding the mean of a set of numbers in which some elements of the set carry more importance, or weight, than others.8`  @ Y2"՚ @A@ 1 !i @ A@B@ 800@ @@@@@ @@@ *)RLI)J(-QFIJJBII Y(0@( T @ U@8` J@D@D@J@  0**ʰ``  $Q)IU*Q8))U*1 DK a`a ``` `1II@X1@`pk)