Question 562284
{{{2a=8}}}...........(1)
{{{a+b=2}}}..........(2)


{{{2a=8}}}
Divide by 2 both sides of above equation
{{{2a/2=8/2}}}
{{{cross(2)a/cross(2)=cross(8)/cross(2)}}}
{{{a=4}}}
Put the value of a in (2)
{{{a+b=2}}}
{{{4+b=2}}}
{{{b=2-4}}}
{{{b=-2}}}

a,b=4,-2

Check
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Put the value of a and b in (2)
{{{a+b=2}}}
{{{4+(-2)=2}}}
{{{4-2=2}}}
{{{2=2}}}