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Unknown008 · Mar 13, 2011, 04:51 AM

Right, now,

$14$\frac{100(4a + b)}{14}$$

henrypoo · Mar 13, 2011, 04:54 AM

1400(4a+b) / 196?

Unknown008 · Mar 13, 2011, 04:56 AM

Then, why did you tell me that:

$2$\frac12$ = 1$

?

If you did what you just did to 14 up there, you'd have:

$2$\frac12$ = \frac24$

:eek:

So, some confusion from your part? :confused:

henrypoo · Mar 13, 2011, 05:06 AM

So it should be 1400(4a+b) / 14

Unknown008 · Mar 13, 2011, 05:12 AM

Yes, now you got it.

And what can you do now? Do you see why I chose to multiply both sides by 14? You can now reduce the fraction.

Just like you reduce 200/2 to 100/1 to finally 100.

henrypoo · Mar 13, 2011, 05:17 AM

So its (4a+b) / 100?

Unknown008 · Mar 13, 2011, 05:39 AM

Try again...

$\frac{1400(4a + b)}{14} = $\frac{1400}{14}$(4a+b)$

henrypoo · Mar 13, 2011, 05:42 AM

(100)(4a+b)?

Unknown008 · Mar 13, 2011, 05:56 AM

Right! :)

Now let's do another one, still to solve this problem.

$12\ 600 = 100(4a+b)$

Can you divide both sides by 100? :)

henrypoo · Mar 13, 2011, 05:59 AM

126=(1)(4a+b)?

Unknown008 · Mar 13, 2011, 06:10 AM

Good! Now, save this for later. The other one now.

$7000 = \frac{100(6a + b)}{16}$

Can you try putting it in the form of the one you just did?

henrypoo · Mar 13, 2011, 06:12 AM

can you show me the final step for 126 = (1)(4a+b)?
so that the other one I know how to do.

henrypoo · Mar 13, 2011, 06:14 AM

the other part is 112 = (1)(6a+b)

Unknown008 · Mar 13, 2011, 07:02 AM

Originally Posted by henrypoo

the other part is 112 = (1)(6a+b)

Geesh, it's only now that I notice that you made a wrong calculation earlier, 9000*14 = 126,000, not 12,600.

Not quite. I get:

1120 = 6a + b

(after distributing 1 into the brackets)

Okay, now we have:

1260 = 4a + b
1120 = 6a + b

We can get a and b from there. Subtract both equations:

Code:

1260 = 4a + 1b
1120 = 6a + 1b -
     =  a +  b

henrypoo · Mar 13, 2011, 07:04 AM

sorry sorry. To sum up the other question. I have done the 2 equation.

0= 4a+b -126
0= 6a+b - 112

from the above I can find a and b using stimultaneuos equation?

Unknown008 · Mar 13, 2011, 07:12 AM

Right, a correction is to be made through, it's 1260 and 1120 and one last thing, you posted in the wrong thread :p

Ok, I'm moving those posts.