Question 221111
You can't solve it. There are 2 variables, x and y, 
so you need 2 equations to solve.
You wrote
{{{x=y=5}}}. I think you mistyped & actually
meant {{{x + y = 5}}}
That's your other equation
Multiply both sides of this equation by {{{24}}}
{{{24x + 24y = 120}}}
Now subtract it from the other equation
{{{24x + 28y = 132}}}
{{{-24x - 24y = -120}}}
{{{4y = 12}}}
{{{y = 3}}}
and, since {{{x + y = 5}}}
{{{x = 2}}}
Hope this helps