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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

 Oct 27, 2017

Best Answer 

 #1
avatar+7348 
+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

 Oct 27, 2017
 #1
avatar+7348 
+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

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