What is the constant of proportionality in the direct variation represented on the following graph 1. 4
2. -4
3. 1/4
4. -1/4

-4

Step-by-step explanation:

First find the slope

We need two points

( -1,4) and (0,0)

m= (y2-y1)/(x2-x1)

   = (0-4)/(0- -1)

    = -4 / (0+1)

    = -4/1

   = -4

The constant of proportionality is -4

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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step-by-step explanation: