Question 1123242
Maybe you mean:
Find the values of X and Y in A B C D
AB = 2y + 1
2y = AB - 1
y + {{{(AB-1)/2}}}
:
BC = y + 1
y = BC - 1
:
CD = 7x-3 
7x = CD + 3
x = {{{(CD+3)/7}}}
:
DA = 3x
x = {{{(DA)/3}}}