Question 200693
{{{a+b=8}}}
{{{a = 8-b}}}


{{{a*b=2}}}
{{{(8-b)*b = 2}}}
{{{8b-b^2 = 2}}}
{{{0 = b^2 -8b + 2}}}

Use the quadratic equation to solve
*[invoke quadratic "x", 1, -8, 2]