Question 874335
Let e = evan
Let Cody=2e
Eight years ago, e+c=8
{{{(e-8)+(2e-8)=8}}}
Associative and commutative and definition of subtraction
{{{e+2e-8-8=8}}}
Add 16 to both sides
{{{e+2e=24}}}
{{{3e=24}}}
{{{e=8}}}
Evan is 8 and Cody is 16.