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Direct Variation k=y x Example and (4,6) (8, 12) (2, 3) y = kx or x 4 8 2 y 6 12 3 STEP 1 Place the y value over the x to make a fraction y x 6 4 12 8 3 2 STEP 2 Simplify the fraction – this is your constant k 6/4 = 3/2 12/8 = 3/2 3= k 2 NOTE – if your fractions are not all the same, then it is NOT a direct variation. STEP 3 Put your k into the equation y=kx DIRECT VARIATIONS Must be straight and go through the origin. As x increases, y increases As x decreases, y decreases y=3 x 2