y3 x y3 - y (3)3 x 3(3) - 3 9 x 9 - 3 = ? 9 x 9= 81 81 - 3 = 78 I hope that solves your problem
x3-y3
One equation with two unknowns usually does not have a solution.
72
no
No
3xyz
36 divided by 9 equals 4
There is no "equals" sign therefore "x-9" is NOT an equation.
30
21
This is called an equation....