The first of each section is done for you as an example.
Determine whether the values in the table represent direct variation. If so, write the
equation for variation.
1.
x 2 3 4 5 6
y 4 9 16 25 36
No, y = x2
2.
x 0 1 2 3 4
y 10 12 14 16 18
3.
x 5 10 15 20 25
y 10 20 30 40 50
For 4-10, y varies directly as x (y = kx). Find the constant of proportionality and
write the equation that relates x and y.
4. y = 21 when x = 7 3x = y
5. y = 2 when x = 1
6. y = 1 when x = 1/3
7. y = 24 when x = 8
8. y = 12 when x = ¼
9. y = 4 when x = 20
(source)