Question

If a point $(1,2)$ lies on the line represented by the equation $3y=ax+7,$ then the value of $a$ is .

• A. $-1$
• B. $1$
• C. $2$

Answer 1

The correct option is A

$-1$

Given that $(1,2)$ lies on the line represented by the equation $3y=ax+7.$
Substituting $x=1$ and $y=2$ in $3y=ax+7,$ we get
$3\left(2\right)=a\left(1\right)+7.$
$⟹a+7=6$
$⟹a=-1$