In this problem, y varies directly with x. Find the unknown value.
Find the value of y when x = 12, if y = 3 when x = 5.

O1.25
O8
O20
O None of the above

y = 9  when  x = 4

Step-by-step explanation:

If  y  varies inversely as  x  then XXX x ⋅ y = c  for some constant  c  

Given  y = 12  when  x =3  XXX 3 ⋅ 12 =c

XXX ⇒ c = 36  

So XXX x ⋅ y = 36   and when  

x = 4  

XXX 4 *y = 36  

XXX ⇒ y = 9

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.