Question

if p varies directly as q and p is equal to 21 when q is equal to 7,then find q when p is equal to 15​

Answer 1

Answer:

The value of q when p=15 is 5

Step-by-step explanation:

Given:

p varies directly as q

That is, p is directly proportional to q

$p\,\propto\,q$

$\implies\,p=kq$

$\text{when p=21 and q=7}$

$21=k(7)$

$21=k(7)$

$\implies\,k=\frac{21}{7}=3$

$\therefore\,p=3q$

$\text{when p=15,}\,15=3q$

$\implies\,q=\frac{15}{3}$

$\implies\bf\,q=5$

Find more:

Let y varies directly us 2x+1 .if y=12 when x=3/2 then write a linear equation what is then value of y when x=7 ? 

pls solve this problem I mark you brainlist​

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