The closest distance is C. 12 feet
Hello,
I suppose equations are:
x+y=3 (1)
x+2y=9 (2)
(2)-(1)==>y=6
(1)==>x=3-6
x=-3, y=6
Sol={(-3,6)}
Its true for integers if you are using the associative property in addition or multiplication ONLY.
Answer:

where,
SP=Selling price
CP=Cost price
<h3>
For example:</h3>
Given,
Selling price(SP)= 1000
Cost price(CP)=800
Now,

Hope this helps...
Good luck on your assignment..