review 3

Front

1. 1. Given the variation equation y=3x, give the constant of variation.

Back

k=3

Front

2. 2. Give the constant of variation that defines the relation in this table

x=(1,2,3,4)

y=(3,6,9,12)

Back

y=kx

3=k(1)

k=3

Front

3. 3. if y varies directly as x and y=24 when x=6, find the variation constant and the equation of variation

Back

y=kx

24=k6

k=4

equation: y=4x

Front

4. 4. if x varies directly as y and x=35, when y=7, what is the value of y when x=25

Back

x=ky

35=k(7)

k=5

x=ky

25=5y

y=5