Joanna would have spent $8.94 on apples at the farmers market.
The HL theorem is a special case of the SSS postulate.
X+2y=23
X=-2y +23
Plug this in for x in the second equation
5(-2y + 23) + 10y = 55
-10y + 115 + 10y = 55
The -10y + 10y cancel out, so there is no solution
Hope this helps!