Question 1197998
8.
 If {{{y}}} varies inversely as {{{x}}}then

{{{y=k/x}}} 


 if {{{y = 15}}} when {{{x = 3}}}, then

{{{15=k/3}}} 

{{{k=45}}} 

formula:

{{{y=45/x}}} 

find {{{y }}}when {{{x = 1}}}

{{{y=45/1}}} 

{{{y=45}}} 


answer:

A. {{{45}}}



9. If {{{p }}}varies inversely proportional to {{{q}}}. 

{{{p=k/q}}} 

If {{{q = 6}}}  when {{{p = 18}}} , 

{{{18=k/6}}}

{{{k=18*6}}}

{{{k=108}}}

formula:

{{{p=108/q}}} 


find {{{q }}} when {{{p = 10}}}:

{{{10=108/q}}} 
{{{q=108/10}}} 

{{{q=10.8}}} 


answer:

D. {{{10.8}}}



10. If {{{r}}} varies inversely with {{{w - 1}}}. 

{{{r=k/(w-1)}}}

If {{{r = 3/50 }}}when {{{w = 3}}},

{{{3/50=k/(3-1)}}}

{{{3/50=k/2}}}

{{{2(3/50)=k}}}

{{{k=3/25}}}

formula:

{{{r=(3/25)/(w-1)}}}

{{{r=3/(25(w-1))}}}


 find {{{r}}} when {{{w}}} is {{{10}}}

{{{r=3/(25(10-1))}}}

{{{r=3/(25(9))}}}

{{{r=1/(25(3))}}}

{{{r=1/75}}}

answer:

D. {{{1/75}}}