this is an example:
y+7=11
-7 -7
y=4
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There are variables that have a cubic relationship: for example, the side of a cube and its mass.
an expression
Polynomial
There are an infinite number of such equations.Here's one of them:2x + 6 = -x(Since the solution is only 1 number, theequation can only have 1 variable.)
No. You need either another angle or the length of another side. For example, to solve a2 +b2=c2 (the formula for a right triangle, in which c is the hypotenuse) you must have values for 2 variables to solve for the third.