Question 765576
The needed variables are for pounds of peanuts and pounds of chocolate.


Let p=pounds peanuts
let c=pounds chocolate


A 2.5-pound bag represents $14.
{{{p+c=2.5}}} and {{{6.5*p+5*c=14}}}
Solve the system for p and c.


Try this:
{{{5p+5c=5*(2.5)}}} the pounds equation multiplied by 5,
{{{5p+5c=12.5}}}  the pounds equation simplified for easier use.


ELIMINATION OPERATION
6.5p+5c=14
-(5p+5c=12.5)
_________________
1.5p+0=1.5


meaning
{{{highlight(p=1.0)}}} pound, so you can easily find c from this.