The table partially describes a proportional function. What is the value of $\displaystyle{y}\usepackage{cmbright}\Huge\$ when $\displaystyle{x}={5}\usepackage{cmbright}\Huge\$ ?

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

2 -4

4 -8

5

$\displaystyle{x}\usepackage{cmbright}\Huge\$	$\displaystyle{y}\usepackage{cmbright}\Huge\$
2	-4
4	-8
5