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Junior Member
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Mar 11, 2011, 07:47 AM
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my lecturer fail me the second time!
A ship travels between two ports. The cost of fuel is C=$100(ax+b/x+10)
Where x is the average speed of the ship in knots (x > 0) and a and b are constants. If the ship travels at 4 knots the cost of fuel is $9000 but at 6 knots it is $7000.
a) Form two linear equations consist of a and b.
b) Find the values of a and b.
c) If there are two ports that are 1000 knots apart, what is the cost of the fuel.
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Uber Member
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Mar 11, 2011, 08:23 AM
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Since you failed it twice already... if someone hands you an answer you are going to fail a third time because you don't understand it.
How do YOU go about solving it first?
We HELP you with your homework... we don't DO it for you
Link to the rules for homework. https://www.askmehelpdesk.com/math-s...-b-u-font.html
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Uber Member
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Mar 11, 2011, 08:24 AM
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a) Put first C = 9000, x = 4, then a second time using C = 7000 and x = 6.
You'll get two equations.
b) Solve those two equations simultaneously.
c) That questions seems wrong... knots is a measure of speed and two ports cannot be separated by 'some speed'...
I guess that you have to put x = 1000 and use the values of a and b you got earlier for that.
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Junior Member
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Mar 11, 2011, 08:41 AM
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If I can understand the question I will not post it in here already.
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Uber Member
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Mar 11, 2011, 09:46 AM
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Originally Posted by henrypoo
If i can understand the question i will not post it in here already.
I agree, but the issue is, you should have posted what you have attempted. This is the usual procedure. Since you were new here, I didn't really impose it, but if you need more help, posting first what you have attempted would be something I'd encourage you to do.
That said, smoothy was right and his 'thumbs down' was not deserved.
Okay? :)
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Uber Member
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Mar 11, 2011, 09:49 AM
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Originally Posted by ;
henrypoo does not find this helpful : at least give some guide
Firt off. You broke the rules for homework... YOU did take the time to read that link I provided to you Before the rude reddie... didn't you?
Then you get rude and break another rule about WHEN you are allowed to give a not helpful. Site rules Specifically say you can ONLY do that for inaccurate information. What I gave was completely accurate.
You never attempted to even try the question... I asked you how you would try to solve it...
Unknown gave you hints of how to start to solve it... but you want us to hand you the answer without you doing ANY work. Which means you learn nothing and WILL fail it a third time.
If you can't try... we aren't going to do it for you. That's why you have homework... its to learn how to do something.
Incidentally... I'm reporting this to site admins.
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Junior Member
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Mar 11, 2011, 09:01 PM
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But how to solve the equation. Without b how to find a??
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Uber Member
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Mar 12, 2011, 12:02 AM
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What did you get for part (a) ?
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Junior Member
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Mar 12, 2011, 01:28 AM
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for part a is 9000=100(ax+b/x+10)
for part b is 7000=100(a(4)+b/6+10)
this is where I got stuck. I gt the 2 equation but for the second qns they ask me to find the value of a and b!
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Junior Member
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Mar 12, 2011, 01:50 AM
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sorry for part a is 9000=100(a(4)+b / 4+10)
part b is 7000=100(a(6)+b / 6+10)
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Uber Member
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Mar 12, 2011, 02:01 AM
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Right, can you simplify it a bit? Work out the denominator, then cross multiply for both.
Note that it's still in part (a). Part (b) is not involved yet.
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Junior Member
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Mar 12, 2011, 10:11 PM
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9000= (400a+100b / 1400)
I don't know how to cross multiply cause I never learn this before.
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Uber Member
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Mar 13, 2011, 02:14 AM
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Part (a)
Put C = 9000, and x = 4;
What is 4+10 in the denominator on the right?
Can you expand the numerator on the right?
That's the first part in (a)
Second part in (a), put C = 7000, x = 6
So the same thing as part one.
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Junior Member
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Mar 13, 2011, 04:01 AM
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so for part a is it like that?
9000 = 100(4a+b) / 14
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Uber Member
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Mar 13, 2011, 04:12 AM
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Yes the first part in part (a) is that. Now multiply both sides by 14, what do you get?
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Junior Member
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Mar 13, 2011, 04:25 AM
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Multiply both side as in 14 times 9000,100,4a and b?
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Uber Member
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Mar 13, 2011, 04:28 AM
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No, like this:
From this:
to this:
Can you work this out?
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Junior Member
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Mar 13, 2011, 04:38 AM
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12,600= 1400(4a+b) / 196 ?
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Uber Member
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Mar 13, 2011, 04:43 AM
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Not totally true...
What is 2 times 1/2 ?
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Junior Member
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Mar 13, 2011, 04:46 AM
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1?
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