Question

Solve the following pair of linear equation by the substitution method
$3x-y=3$
$9x-3y=9$

Answer 1

$3x-y=3$

$x=\frac{3+y}{3}$

And , $9x-3y=9⟶\left(i\right)$

Substituting the value of $x$ in equation $⟶\left(i\right)$

$9\left(\frac{3+y}{3}\right)-3y=9\Rightarrow 9+3y-3y=9$

$\therefore$ It would be satisfied the value of $y$ and $x.$

So, It has infinitely many solutions.