Answer:
x=-3.875
y=1.625
x+y=5.5
Step-by-step explanation:
Given:
9(1-x)=27y
x-y=-11/2
then:
x=y-11/2 OR 5.5
substitute:
9(1-[y-5.5])=27y
9-9[y-5.5]=27y
9-9y+49.5=27y
simplifying:
36y=58.5
y=1.625
x=1.625-5.5=-3.875
Proof:
x-y=5.5 then -3.875-1.625=-5.5 =-11/2
9(1-x)=27y then 9(1-(-3.875))=27(1.625) then simplified
9(4.875)=43.875 or 43.875=43.875
