Question 365011
{{{L + B = 216000}}}
{{{L = B + 48000}}}
By substitution:
{{{B + 48000 + B = 216000}}}
{{{2B = 216000 - 48000}}}
{{{2B = 168000}}}
{{{B = 84000}}}
and
{{{L = 84000 + 48000}}}
{{{L = 132000}}}
Bob earns $84,000 per year and Lois earns $132,000 per year