How are graphs used to solve equations?
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Any figure represented by an equation in two variables is a curve in two dimensions. For example, the equation 3x + 4y = 8 is also called a linear function because the solution represents a line (which is considered a “curve” in geometry) on a graph. There are also graphs of equations in three variables, with the solution as a surface—or the two-dimensional “outer layer” of a three-dimensional object.