Question

Complete the equation of variation where y varies inversely as x and y = 80 when x = 0.7.

Answer 1

Answer:

$y=\frac{56}{x}$

Step-by-step explanation:

We are given that y varies inversely with x.

y=80 when x=0.7

We have to write complete equation of variation

According to question

$y\propto \frac{1}{x}$

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

Where k=proportionality constant

Substitute the values then we get

$80=\frac{k}{0.7}$

using multiplication property of equality

$k=80\times 0.7=56$

Therefore, the equation is given by

$y=\frac{56}{x}$

Answer 2

Y varies inversely with x
means that y=k/x 
with x=0.7 and y=80
we have 80=k/0.7
k=0.7x80=56
so the equation is 
y=56/x