suppose there are only two goods food and shelter. the demand equations for these two goods depend on their prices pf and ps follows :

Df(pf,ps)=10-2pf-ps

Ds(pf,ps)= 10-pf-2ps

The supply curves depend only on their own prices :

sf(pf) =pf

ss (ps) = 5ps

Determine the equilibrium price and quantity of these goods.