Question

Roby has an average of 80 customers daily. Sadly, the customers are decreasing by 8 persons daily. Find the graph for the equation representing this given information.

• A.
• B.
• C.
• D. Can't be determined

Answer 1

The correct option is A

Roby started with 80 customers but he is losing 8 customers daily.

The equation for the number of customers Roby has is:
$\text{y}=-8\text{x}+80$

As, $b$ = 80, we plot first point at (0,80).

Now, $m=-8=\frac{\text{Change in y-axis}}{\text{Change in x-axis}}$

With respect to the point (0,80), we have to move 1 unit from 0 along the x-axis.

Similarly, from (0,80), we have to move -8 units from 80 along the y-axis as: $80-8=72$


∴ The second point on the graph is (1,72).

We mark these points on the graph and join the line connecting them.

The graph is:

So, the option (a) is the correct answer.