Question 1069276
Multiple solutions means the equations are multiples of each other.
{{{u(3x+5y)=13u}}}
{{{3ux+5uy=13u}}}
Compare to the second equation,
{{{13u=39}}}
{{{u=3}}}
So,
{{{a=3u=3(3)=9}}}
{{{b=5u=5(3)=15}}}