Question 902728
u = pounds of cheap food
v = pounds of expensive food


5 pounds of food each day, {{{u+v=5}}}.


Afford $35 on this food each day, {{{4u+12v=35}}}.


The system of equations will match the 35 dollars and the 5 pounds.


Starting with elimination method,
{{{4u+12v-(4u+4v)=35-4*5}}}
{{{8v=35-20}}}
{{{8v=15}}}
{{{highlight(v=15/8)}}}, 1 pound 14 ounces of the expensive food