If the point $(3, 4)$ lies on the graph of the equation $3y = ax + 7$,find the value of $a$.

For the equation $5x + 3y = 90$,if $x = 12$,then $y = \dots$

State whether the following statement is True or False. Justify your answer:
The coordinates of points in the table:

$x$	$0$	$1$	$2$	$3$	$4$
$y$	$2$	$3$	$4$	$-5$	$6$

represent some of the solutions of the equation $x-y+2=0$.

If $(5, 2)$ is a solution of the equation $kx + 4y = 33$,find the value of $k$.

The linear equation $3x - y = x - 1$ has:

Write four solutions for the following equation: $2x + 3y = 7$.