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March 29th, 2014, 08:12 AM   #1
Joined: Mar 2014
From: London

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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.
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March 29th, 2014, 10:16 AM   #2
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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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