Question

The graph below represents the price of sending text messages using the services of a phone company. What is the constant of proportionality?
8
14
16
48

Answer 1

Answer:

16

Step-by-step explanation:

The reason the answer is 8 is because if you see it is going up by 16's. If you see 0,16,32,48,64 all be 16's.

Answer 2

Answer:

8

Step-by-step explanation:

The equation is of the form

y = kx ← k is the constant of proportionality

To find k use the slope formula

k = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (0, 0) and (x₂, y₂ ) = (2, 16) ← 2 points on the line

k = $\frac{16-0}{2-0}$ = $\frac{16}{2}$ = 8