# Shared Flashcard Set

## Details

Direct Variation
Students will use flashcards to study the basics of direct variation.
10
Mathematics
04/11/2011

Term
 Is the following equation a DIRECT VARIATION function?   y = -x
Definition
 YES!(Because it is in the form "y = kx" where k = -1)
Term
 [image]
Definition
 DIRECT VARIATION(Because the graph goes through the origin!)
Term
 [image]
Definition
 NOT DIRECT VARIATION(Graph does not go through the origin!)
Term
 [image]
Definition
 DIRECT VARIATION(Graph goes throught the origin!)
Term
 [image]
Definition
 NOT DIRECT VARIATION(Graph does not go through the origin!)
Term
 [image]
Definition
 DIRECT VARIATION(Graph goes through the origin!)
Term
 Is the following equation aDIRECT VARIATIONfunction?y = 3x
Definition
 YES!(Because it is in the form "y = kx" where k = 3)
Term
 Is the following equation aDIRECT VARIATIONfunction?y = x + 2
Definition
 NO!(Because direct variation functions never have addition or subtraction in them..They should be in the form "y = kx")
Term
 What is theCONSTANT OF VARIATIONfory = 6x?
Definition
 TheCONSTANT OF VARIATION (k)is 6!
Term
 If the point (2, 8) is on a direct variation function, what is the CONSTANT OF VARIATION?
Definition
 SOLUTION: Direct Variation Equation:  y = kx The point (2, 8) is an (x, y) Replace x and y in the equation for the x & y coordinates: 8 = k(2)   Divide by 2 on both sides to get:   k = 4
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