1) Which of the following statement is true for direct variation? a) x increases y decreases b) x decreases y increases c) as x increases,y also increases d) x and y stay constant e) x increases,y stays constant f) none of the above 2) What is the general formula for direct variation a) y = x2 b) x - y = k c) y = k + x d) y = x e) x = y f) x = ky 3) if y varies directly as,what happens to the value of y if x is reduced to half a) y increases b) y becomes zero c) y is doubled d) y is also reduced to half e) y remains the same f) None of the above 4) Circumference (c) of a circle is directly proportional to its radius(r) .Write in direct variation a) c ∝ r2 b) c = r c) c ∝ r d) cr e) r - c f) c x r 5) if x varies directly as y, when x=9,y=3. Find constant of variation. a) 6  b) 3 c) 9 d) 12 e) 0 f) 2

Direct Variation

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