It is very common to use, but it is not the only variable you can use.
Not always. It could be a constant. For example x is one variable, and y = x-2 is another variable. Then x - y = x - (x-2) = 2.
Yes. A variable by itself, or anything that contains a variable, would be a variable expression (unless the variable cancels out, as in "x - x", which always has the same value).
The independent variable is always on the x-axis of a coordinate plane. The dependent variable is always on the y-axis. This is true because y always depends on x.
By convention, 'x' is almost always the independent variable, but it doesn't have to be.
x=3 means that the x variable always stays constant, so the y variable can change as much as it wants, but x will always be 3. on a graph, this would like a vertical line. (It should be perpendicular to the x variable's line...if that helps a visual:P)
the y variable always changes and x is constant
Not always. It could be a constant. For example x is one variable, and y = x-2 is another variable. Then x - y = x - (x-2) = 2.
Yes. A variable by itself, or anything that contains a variable, would be a variable expression (unless the variable cancels out, as in "x - x", which always has the same value).
The independent variable is always on the x-axis of a coordinate plane. The dependent variable is always on the y-axis. This is true because y always depends on x.
By convention, 'x' is almost always the independent variable, but it doesn't have to be.
x is used a lot to represent an independent variable. When time is the independent variable t is often used as well.
Since y depends on x and x is the independent variable, y has to be the dependent variable. That means that y always changes because of x.
x=3 means that the x variable always stays constant, so the y variable can change as much as it wants, but x will always be 3. on a graph, this would like a vertical line. (It should be perpendicular to the x variable's line...if that helps a visual:P)
The dependent variable may change in response to the manipulated variable.
Always when using a line graph use the x-axis for independent variable and the y-axis for dependent variable.
43 never changes ... it's always 43 ... so 43 is a constant. 'x' is the variable.
This X2/X = X ==========yes X/3 = ?????? ==============No Yes it can. However, dividing by a variable doesn't always work since the variable could evaluate to zero, and you cannot divide by zero. Similar is true if the non-variable is zero.