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If y equals3 then y3-y equals?

How do you not know this? y = 3. y^3 - y = y(y^2-1) = y(y+1)(y-1) = 3*4*2 = 24.     I apologize, for the person who first answered this question is only aware of h (MORE)
In Algebra

What is y equals 8x?

y equals 8x is a straight line pasing through the origin (0,0) and having a gradient (slope) of 8 (i.e. gradient = "change in y" divided by "change in x" )

Is the problem y equals 3x a direct variation if so what is the constant of variation?

y=3x is a direct variation in that y varies directly with x by a factor of 3. Any linear equation (a polynomial of degree 1, which is a polynomial equation with a highest expo (MORE)
In Algebra

What is the solutions for this problem 3x plus y equals 7 x equals 2y?

So we have a statement that 3x + y = 7x = 2y. Can we find some values for x and y that will satisfy the statement? Suppose the statement is true, then we have 3x + y = 7x, (MORE)