Answer:
Step-by-step explanation:
The next number is 1. Divide 3 by 3 as you have done in the previous numbers.
Answer:
12
Step-by-step explanation:
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Point form: (1,-1)
equation form: x = 1, y = -1
A proportion looks like this:
![a\div b = c\div d](https://tex.z-dn.net/?f=a%5Cdiv%20b%20%3D%20c%5Cdiv%20d)
It means that the quantity a,b,c and d are in the same proportion: the ratio between a and b is the same ratio between c and d.
They are particularly useful in situation when you have an example given, and you want to extrapolate the relationship for another couple.
For example, you can think of the following problem: "Five apples cost 2 dollars. How much will 8 apples cost?"
You can build the proportion
![5\div 2 = 8\div x](https://tex.z-dn.net/?f=5%5Cdiv%202%20%3D%208%5Cdiv%20x)
And then solve it for x:
![\dfrac{5}{2}=\dfrac{8}{x} \iff 5x=16 \iff x = \dfrac{16}{5} = 3.2](https://tex.z-dn.net/?f=%5Cdfrac%7B5%7D%7B2%7D%3D%5Cdfrac%7B8%7D%7Bx%7D%20%5Ciff%205x%3D16%20%5Ciff%20x%20%3D%20%5Cdfrac%7B16%7D%7B5%7D%20%3D%203.2)