Answer:
![k = 40](https://tex.z-dn.net/?f=k%20%3D%2040)
Step-by-step explanation:
Given
The attached graph
Required
Calculate the constant of proportionality.
Represent the required constant with k.
Such that:
![k = \dfrac{y}{x}](https://tex.z-dn.net/?f=k%20%3D%20%5Cdfrac%7By%7D%7Bx%7D)
Pick any two corresponding values of x and y
![(x,y) = (1,40)](https://tex.z-dn.net/?f=%28x%2Cy%29%20%3D%20%281%2C40%29)
This means that:
![x = 1\ and\ y = 40](https://tex.z-dn.net/?f=x%20%3D%201%5C%20and%5C%20y%20%3D%2040)
becomes
![k = \frac{40}{1}](https://tex.z-dn.net/?f=k%20%3D%20%5Cfrac%7B40%7D%7B1%7D)
![k = 40](https://tex.z-dn.net/?f=k%20%3D%2040)
Answer:
the slash is the same as a division sign. it is also used for fractions. when you are trying to divide fractions to turn it into a decimal, you use the same sign to divide.
Step-by-step explanation:
hope this helps :)
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Irrational
We know that pi is irrational (we can’t express it as a ratio of two numbers), and we are multiplying it by a rational number (-2). However -2 lots of something with infinite digits, will still have infinite digits, therefore it is irrational.