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March 29th, 2014, 08:12 AM  #1 
Newbie Joined: Mar 2014 From: London Posts: 2 Thanks: 0  Please this is urgent!!
IMPORTANT NOTE In the following, x^2, x^3, mean "x squared", "x cubed", respectively. Generally, a^n means "a to the power n". 1. Y is proportional to (1  X). When X = 2, Y = 2. Find the value of X required to give Y = 6. 2. Z is proportional to (X  2). When X = 1, Z = 1. Enter the value of X required to give Z = 2. 3. X is inversely proportional to Y. When X = 2, Y = 3. Find the value of Y required to give X = 4 [Express your as a decimal correct to 2sf 4. V is proportional to (T+1)^2. When T= 1, V = 1. Enter (as a decimal) the value of V when T = 2. 
March 29th, 2014, 10:16 AM  #2 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233 
The words 'a is proportional to b' translate So your question 1) translates Make the substitutions from the given info and solve for k So the relation for 1) is Now use Y = 6 to solve for X Your question 2) is done similarly. The words 'a is inversely proportional to b' translate So your question 3) translates Proceed as i have done for question 1) , substitute the given info , solve for k , then use the relation to solve for Y. For your question 4) you should get Now do as shown above. 

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