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a statement of two conditions which must both be true in order for the statement to be true
simultaneous equations that have a single solution; graphs are lines that intersect at a single point
Constant of Proportionality
a constant in an equation that defines the relationship of two or more variables; for example, 4 is the constant of proportionality in the equation y = 4mx
a plane with a coordinate system that can be used to designate the position of any point in the plane
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