VARIATION

1. if y varies directly as x and y =30 when x=15.find y if x =50

1.1. y/x=k

1.2. 30/15=2=k

1.3. y=kx;then

1.4. y=2x50

1.5. y=50

2. the effect on the circumference if the radius is doubled, the circumference is skso doubled

2.1. if r us tripled what do you think will happen to the circumference?

3. the curcumferencevof a circle varies as its radius. what is the effectvon the circumference ifvthe ratio is doubled?

3.1. c=kr

3.2. k=2pi

3.3. if the rafius is doubled then,

3.4. C=2pi2r

3.5. C=4pir

3.6. thus:4pir/2pir=2

4. Direct varition

4.1. a direct variation is a type of relationship between quantities that describes an increase-.increase or decrease-decease trend between cariables

5. y is directly proportional to

6. expressed as

6.1. y varies as

6.2. y/x= k

6.3. y varies directly as

6.4. y/x=y1/x1=y2/x2=k

6.5. it is express as as a ratio, where this ratio is describe to be constant within the relationship.