Mathematics: Hey guys! as you can tell from my username, i hate ｎｉｇｇｅｒｓ！

Hey guys! as you can tell from my username, i hate

larkinc2946

08.09.2020

y varies directly with x if and only if there exists a constant k such that

y=kx

for every input/output couple. If so, we have

$\dfrac{y}{x}=k$

Let's see if our input/output couples satisfy this request: the first couple yields

$\dfrac{y}{x} = \dfrac{6.4}{4}=1.6$

The second couple yields

$\dfrac{y}{x} = \dfrac{11.2}{7}=1.6$

The third couple yields

$\dfrac{y}{x} = \dfrac{16}{10}=1.6$

The last couple yields

$\dfrac{y}{x} = \dfrac{20.8}{13}=1.6$

So, the ratio is indeed constant

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