3x+y=6
3x-y=6
Cancel out the Y and add the terms
6x=12
X=2
Plug 2 into one of the original equations to find Y
3(6)+y=6
18+y=6
Y=-12
Write as ordered pair: (6,-12)
Answer:
x= 3 +
, 3 -
Step-by-step explanation:
You use the quadratic formula to get x= 
Then you simplify and get the answers x= 3 +
, 3 -
There are 120 blocks left.
7a + 6c + 9a - 15c
-- Look for all the 'a's 7a, 9a
-- Addum up 16a
-- Look for all the 'c's 6c, -15c
-- Addum up -9c
-- Write the results 16a - 9c