5x - 10y = -40
-10y = -40 - 5x
y = -40 - 5x / -10
The 8th person is sitting across from the 2nd person
If there is $1,000 for the pipes, then you can buy 5 steel pipes for $500 and to plastic for 500 too.
1/9
Find the common denominator, 1/3 can be multiplied to get to ninths. 1/3 is equivalent to 3/9, and so 4/9 minus 3/9 is 1/9.
