Q: What is an equation that has the variables x and y called?

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It is a linear equation in the variables x and y.

Given two variables, X and Y, the rate of X relative to Y is X/Y.

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y=x+2

Y = 2X Variables are X and Y If X = 2, then Y = 4 If X = 3, then Y = 6 and so forth. If you vary one then he other changes. Their values are variable.

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It is a linear equation in the variables x and y.

It is a linear equation in 2 variables, x and y. It cannot be solved for either x nor y without another, independent equation.

If an equation has two variables, we'll call them (x,y), the variables can be any value as long as both sides of the equation have the same result. If the equation was x = y, then the variables could be (1,1), (2,2), (3,3),etc...

Given two variables, X and Y, the rate of X relative to Y is X/Y.

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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.

Y = 2X Variables are X and Y If X = 2, then Y = 4 If X = 3, then Y = 6 and so forth. If you vary one then he other changes. Their values are variable.

x, y ,z

y=x+2

Infinitely many. Assuming the variables are "x" and "y" , for every value of "x" a value for "y" can be calculated.

y = kx, where k is a constant, and x and y are the two variables.

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