Answer:
Direct variation
Step-by-step explanation:
In direct variation, the output is always found by multiplying the input by a certain number, called the constant of variation.
Formula for direct variation: y = kx
Here, when x = -1, y is 2. Subbing these values into y = kx, we get:
2 = k(-1). The const. of var. turns out to be -2.
Now test whether this conclusion applies to the other inputs:
When x = 0, is y = 0, as the table says? Yes.
When x = 1, is y = -2, as the table says? Yes.
Same for inputs 2 and 3; the outputs stem directly from y = -2x.
This set of data represents direct variation.
