Question 1021138
{{{x=-3+y}}} and {{{xy=A}}} for area;


New size,  {{{(x+1)(y+1)=aNewArea}}} and {{{(x+1)(y+1)-xy=18}}}.


{{{xy+x+y+1=xy=18}}}
{{{x+y+1=18}}}
{{{(y-3)+y+1=18}}}
{{{2y-2=18}}}
{{{y-1=9}}}
{{{highlight(y=10)}}} and from this and given, {{{highlight(x=7)}}}.