Draw the graph of the following table. Is it a linear graph?

$x$	$3$	$4$	$5$	$6$	$7$
$y$	$12$	$16$	$20$	$24$	$28$

 

This graph shows the length of a burning candle. How much does the length of the candle decrease every minute.

Write the $y$-coordinate (ordinate) of $\left(3, 5\right)$.