Question

solve it 10 time i post it

Answer 1

Using midpoint formula, we have
$\frac{p}{3}=\frac{\frac{2}{9}}{2}\\ p=\frac{1}{3}\\ \mathrm{Substituting\: this \: point \: in \: the \: equation,}\\ 5(-1)+3(\frac{1\times 3}{3})+2= LHS\\ -5+3+2=LHS\\ LHS=0=RHS.\\ \mathrm{Thus \: proved.}$