Question 198075
{{{4ax+by=11ab}}} and {{{8ax-5by=ab}}}
     mult by 2    then    mult by -1
{{{8ax+2by=22ab}}} and {{{5by-8ax=-ab}}}
add and solve
{{{7by=21ab}}}={{{y=3a}}}
substitute and solve
{{{4ax+b(3a)=11ab}}}
{{{4ax=8ab}}}={{{x=2b}}}
Answer
{{{x=2b,y=3a}}}