The quantities
�
xx and
�
yy are proportional.
�
xx
�
yy
11
1111
1
2
9
1
9
2
1, start fraction, 2, divided by, 9, end fraction
21
2121
2
1
3
2
3
1
2, start fraction, 1, divided by, 3, end fraction
45
4545
5
55
Find the constant of proportionality
(
�
)
(r)left parenthesis, r, right parenthesis in the equation
�
=
�
�
y=rxy, equals, r, x.
�
=
r=r, equals