Question

Describe how to create the graph of the direct-variation relationship "y varies directly with x where y = -8.4 when x = 4."

Answer 1

Using a proportional relationship, the graph of the proportional relationship $y = -2.1x$ is sketched at the end of this answer.

"y varies directly with x", hence, the equation is modeled by:

$y = ax$

y = -8.4 when x = 4, hence, we can use it to find a.

$-8.4 = 4a$

$a = -\frac{8.4}{4}$

$a = -2.1$

Hence, the equation is:

$y = -2.1x$

The graph is sketched at the end of this answer.

To learn more about proportions, you can take a look at https://brainly.com/question/24372153