Benchmark 9C
The Mathematical World: Shapes
Grades 9-12, page 225

Geometric shapes and relationships can be described in terms of symbols and numbers--and vice versa. For example, the position of any point on a surface can be specified by two numbers; a graph represents all the values that satisfy an equation; and if two equations have to be satisfied at the same time, the values that satisfy them both will be found where their graphs intersect.

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