Question 924301
x, price for taco
y, price for burrito


YOU:
{{{2x+5y=29}}}


FRIEND:
{{{2x+4y=22}}}


Solve, suggestion as start with Elimination Method... ,
handled purely mentally, y=7.--------------------------------------Thinking very carefully about this result, something is wrong in the problem's description.


Think how the actual data compare.  The only difference is 1 burrito and 7 dollars.  This just cannot make any sense.