Question 620190
Let melinda's pay be l
Let barb's be b
You are told
{{{m = b - 115}}}
{{{m + b = 411}}} substitute the first eqaution's value for m into the second one
{{{(b - 115) + b = 411}}}
{{{2b = 411+115}}}
{{{2b = 526}}}
{{{b = 263}}}
so m = 263-115 = 148