Each side=9 bc 9 times 9 times 9=729
Y(5y) + y(4) + 3y^2
5y^2 + 4y + 3y^2
8y^2 + 4y
So she bought 10 pounds and she need 13 total so
10+x=13
subtract 10 from both sides
x=3
she needs to buy 3 more pounds of potting soil (number of bags depends on how many pounds per bag)
4x + 2x - 6 = 8x + 12
Distributive property
6x - 6 = 8x + 12
Combine like terms
(6x - 6x) - 6 = (8x - 6x) + 12
-6 = 2x + 12
Subtract
-6 - 12 = 2x (12 - 12)
-12 = 2x
Subtract again
-12/2 = 2x/2
Divide
-6 = x
One solution