Lots of the other letters of the alphabet are used for either constant numbers or variables that are based on certain formula.
C for instance is the speed of light in a vacuum (a constant)
m is normally used for mass (a variable).
x and y were most likely used as they were letters least likely to be used for representation of anything else and so the idea stuck to use them as calculable variables.
Hope this helps.
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How many variables are displayed in a scatterplot?one along the x-axis, and one along the y-axisone along the x-axis, and two along the y-axistwo along the x-axis, and one along the y-axistwo along the x-axis, and two along the y-axis
Two variables, x and y are in inverse variation if x*y = c for some constant c. The equation can be written in the form y = c/x.
It is a linear equation in the two variables x and y. A single linear equation in two variables cannot be solved for a unique pair of values of x and y. The equation is that of a straight line and any point on the line satisfies the equation.
4x + 2y = 30 Since there are two variables ('x' and 'y'), two independent equations are needed in order to find unique values for both variables. With only one equation, there are millions of sets of values for 'x' and 'y' that satisfy it. For example: x = 4 and y = 7 satisfies it, and so does x = 6 and y = 3.
Suppose the two variables are denoted by X and Y. If Y is a constant multiple of X, that is Y = c*X, then the variation is direct. If the value of X*Y is a constant, that is Y = c/X, then the variation in inverse.