Question 346558
Two years ago, John was {{{J-2}}}.
1.{{{S=2(J-2)}}}
2.{{{S-J=2}}}
From eq. 2,
{{{S=J+2}}}
Substitute into eq. 1,
{{{J+2=2J-4}}}
{{{-J=-6}}}
{{{highlight(J=6)}}}
Then from eq. 2,
{{{S-6=2}}}
{{{highlight(S=8)}}}
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Today, John is 6 and Sam is 8.