Question 485893
Let x chickens
Let y sheep
{{{system(x+y=68,2x+4y=270)}}} 
divide the second equation by 2
{{{system(x+y=68,x+2y=135)}}} 
subtract the first equation from the second
{{{y=67}}} sheep
Substitute {{{y=67}}} into the first equation
{{{x+67=68}}}
{{{x=1}}}chicken
A farmer has 1 chicken and 67 sheep