Question 9b6bf9d

Algebra - Linear functions

$x$	$g (x)$
$1$	$54$
$2$	$51$
$3$	$48$
$4$	$45$

For the linear function $g$ , the table shows four values of $x$ and their corresponding values of $g (x)$ . The function can be written as $g (x) = m x + b$ , where $m$ and $b$ are constants. What is the value of $b$ ?