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Constant of Proportionality Constant of Proportionality Explore how y = kx creates a straight line through the origin Constant k (slope): k = 2.0 X Value: x = 5.0 Constant (k) 2.0 X Value 5.0 Y Value 10.0 Ratio (y/x) 2.0 y = 2.0x What is the Constant of Proportionality? The constant of proportionality (k) is the constant ratio between two proportional quantities. In the equation y = kx , k represents this constant. ...