The table partially describes a proportional function. What is the value of $\displaystyle{y}\usepackage{cmbright}\Huge\$ when $\displaystyle{x}={4}\usepackage{cmbright}\Huge\$ ?

$\displaystyle{x}\usepackage{cmbright}\Huge\$
$\displaystyle{y}\usepackage{cmbright}\Huge\$

1 3

2 6

3 9

4

$\displaystyle{x}\usepackage{cmbright}\Huge\$	$\displaystyle{y}\usepackage{cmbright}\Huge\$
1	3
2	6
3	9
4