Question 1113921
 Jack=x Jill=y
{{{x= 3y-5}}}

{{{x+y=23}}} so

{{{(3y-5)+y=23}}} in other words,

{{{3y+y=23-5}}} if you simplify that, 

{{{3y+y=18}}}

{{{4y=18}}}

{{{4y/4=18/4}}}

{{{y=4.5}}} I don’t think you wrote the problem correctly.