Find the value of the coefficient k of the function y = kx if point A (2.5; -4) belongs to the graph of this function.

A function of the form y = kx is called direct proportionality. The plot of this function is a straight line passing through the origin.

A (2,5; – 4) belongs to the graph of the function y = kx.

Let us find the proportionality coefficient k, substituting instead of x = 2.5, and instead of y = – 4.

– 4 = 2.5k,

k = – 4: 2.5

k = – 1.6.

Answer: – 1.6.

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