+0  
 
0
45
1
avatar

the value of y varies directly with x. when y=75,x=1/2 what is they value of y when x=2 1/4

Guest Oct 27, 2017

Best Answer 

 #1
avatar+5198 
+1

y varies directly with x,  so  y = kx   , where  k  is some constant.

 

y  =  kx        When  y = 75 ,  x = 1/2 .   So

 

75  =  k(1/2)       Multiply both sides by  2 .

 

150  =  k

                          So...

y  =  150x

 

To find  y  when  x = 2\(\frac{1}{4}\)  , plug in  2\(\frac14\)  for  x .

 

y  =  150( 2\(\frac14\) )        1/4 = 0.25 ,  so  2 + 1/4 = 2.25

 

y  =  150( 2.25 )

 

y  =  337.5

hectictar  Oct 27, 2017
Sort: 

1+0 Answers

 #1
avatar+5198 
+1
Best Answer

y varies directly with x,  so  y = kx   , where  k  is some constant.

 

y  =  kx        When  y = 75 ,  x = 1/2 .   So

 

75  =  k(1/2)       Multiply both sides by  2 .

 

150  =  k

                          So...

y  =  150x

 

To find  y  when  x = 2\(\frac{1}{4}\)  , plug in  2\(\frac14\)  for  x .

 

y  =  150( 2\(\frac14\) )        1/4 = 0.25 ,  so  2 + 1/4 = 2.25

 

y  =  150( 2.25 )

 

y  =  337.5

hectictar  Oct 27, 2017

20 Online Users

avatar
avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details