Yes.
yes. it is a function
Yes.
yes
No, x = 4 is not a function. I would describe x = 4 as the solution to an equation.
Put the equation in this form: y=mx+b. Then m will be the slope. 2x3y+6=0 2x3y=-6 3y=-6/2x y=-2/2x y=-1/x This equation does not describe a straight line, but rather, it describes a curve.
Yes.
Yes.
4
Yes it is a function. In standard form it is y=x-4.
Yes, the function y=4 will be a straight horizontal line, passing through the point y=4.
x^2y(2x + y)
The expression cannot be simplified.