Question

If $3y=ax+7$ is the linear equation and point $(3,4)$ lies on the equation ,substitute the value of $x=3$ & $y=4$ in the equation, to get the value of $a$.

Answer 1

$3y=ax+7$
$3\left(4\right)=a\left(3\right)+7$
$12=3a+7$
$12-12=3a+7-12$
$\frac{3a}{3}=\frac{5}{3}$
$a=\frac{5}{3}$