Question 176907

Solve:
{{{2a = a}}} and {{{a+b = 2}}}
{{{2a = 8}}} Divide both sides by 2.
{{{highlight(a = 4)}}}
{{{a+b = 2}}} Substitute {{{a = 4}}}
{{{4+b = 2}}} Subtract 4 from both sides.
{{{highlight(b = -2)}}}