A linear equation in two variables will not have a single solution. Its solution set is a line in the Cartesian plane. The solution to non-linear equations will depend on the equation.
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An example could be: 3x-2 = x-6 and so the variable x = -2
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It can comprise all the points of a curve (including a line) in 2-dimensional space. There are only a few, exceptional, cases when one equation in two variables will give a single point as a solution.
X+Y=2 There are a variety of answers to this equation since there are two variables, x and y. For example, X can be .5 while Y is 1.5. Or, X can be -3 while Y can be 5. There is no solution to this problem.
The solution to the equation x = 81.6 is simply x = 81.6. In mathematical terms, this means that the value of x is 81.6. This is a straightforward solution as there are no additional operations or variables involved in this equation.