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March 29, 2024, 08:58:57 pm

Author Topic: Mathematics Question Thread  (Read 1297132 times)  Share 

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bing3

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Re: Mathematics Question Thread
« Reply #180 on: July 14, 2016, 03:22:36 pm »
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How do I do part (b) of this question?

RuiAce

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Re: Mathematics Question Thread
« Reply #181 on: July 14, 2016, 03:26:41 pm »
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How do I do part (b) of this question?



Your answers should be somewhere around the value here.
« Last Edit: July 14, 2016, 03:29:25 pm by RuiAce »

ehatton2016

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Re: Mathematics Question Thread
« Reply #182 on: July 14, 2016, 07:05:20 pm »
+1
Hey!

Firstly, welcome to the forums! Nice job studying for trials; sounds like you're really putting the hours in.

Firstly, two and a bit weeks is ages. You could learn the entire Maths curriculum from scratch in that time.

It looks like you've identified what areas you are weak in, because you have tried doing revision for topics that you lose marks in. What kind of sections are you struggling with? At the end of the day, if there is a section you're not very confident with, and you just do a billion questions of that type, you might not improve at all. That's because, in those sections, it might come down to UNDERSTANDING, before repetition. If you struggle to understand a concept, doing it wrong 100 times won't improve your mark.

Past papers is really all you can do. Write out questions you get incorrect, and redo them once a day for a few days until you can do them with ease. This will solidify the methodology in your mind, and make sure that none of your time is wasted. Again, if you let us know where you are specifically struggling with, maybe we can help!

Keep at it. You have so much time left, and doing past papers DOES help even if it feels like it doesn't. There's no like secret trick or anything, nothing I can tell you right now that will get you 100% in every paper you do. But past papers helps you improve, and identifying areas of weakness will help you improve. If you have any specific questions, post them here, and we can talk them through with you in a way that will hopefully help you understand the fundamental underlying mathematics as well as the answer itself.

You'll be fine! Keep at it.

Jake



Thank you! I will definitely keep doing questions, it's my nerdy form of procrastination! By the way, your chem lecture was great!

jakesilove

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Re: Mathematics Question Thread
« Reply #183 on: July 14, 2016, 07:31:22 pm »
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Thank you! I will definitely keep doing questions, it's my nerdy form of procrastination! By the way, your chem lecture was great!

Really appreciate the positive feedback! Hope you learnt a thing or two, and definitely keep up the interaction on the forums!
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conic curve

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Re: Mathematics Question Thread
« Reply #184 on: July 15, 2016, 12:57:52 pm »
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Just wondering but how do you graph lines (without plotting the points) for the following (I don't remember learning this at school):

x+y, x-y, x-y+3, y-3, x-6, etc (using no graphing calculator)

Thanks

EEEEEEP

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Re: Mathematics Question Thread
« Reply #185 on: July 15, 2016, 01:05:22 pm »
+5
Just wondering but how do you graph lines (without plotting the points) for the following (I don't remember learning this at school):

x+y, x-y, x-y+3, y-3, x-6, etc (using no graphing calculator)

Thanks
You can do it by letting x or y =0 and then find the intercepts.

E.g. If we had an equation say... y = x + 1...
Y intercept
> >let x = 0
y =1

X intercept
>> let y = 0
x = -1

Mark the points (-1, 0), (0, 1)  and the join the two dots with a line.
*Note, the lines can be joined in that fashion as the equation is linear.*
« Last Edit: July 15, 2016, 01:10:23 pm by nerd1 »

jamonwindeyer

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Re: Mathematics Question Thread
« Reply #186 on: July 15, 2016, 01:15:56 pm »
+2
Just wondering but how do you graph lines (without plotting the points) for the following (I don't remember learning this at school):

x+y, x-y, x-y+3, y-3, x-6, etc (using no graphing calculator)

Thanks

You can also use the gradient-intercept form for a line if it happens to be in the correct form, or is easy to get there. If we have an equation that looks like this:



Then it is just a line with a y-intercept of b, and a gradient of m (remember gradient is just rise over run)  ;D

conic curve

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Re: Mathematics Question Thread
« Reply #187 on: July 15, 2016, 02:05:02 pm »
0
You can also use the gradient-intercept form for a line if it happens to be in the correct form, or is easy to get there. If we have an equation that looks like this:



Then it is just a line with a y-intercept of b, and a gradient of m (remember gradient is just rise over run)  ;D

So for the equations, I plotted above you just assume they're all equal to 0

E.g. x-y+3, does this mean x-y+3=0?


jamonwindeyer

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Re: Mathematics Question Thread
« Reply #188 on: July 15, 2016, 02:30:00 pm »
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So for the equations, I plotted above you just assume they're all equal to 0

E.g. x-y+3, does this mean x-y+3=0?

We wouldn't assume it in all cases, but it is very common for equations to be expressed with everything on the left hand side equal to zero, called the general form. So that's how nerd1 interpreted it above  ;D

conic curve

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Re: Mathematics Question Thread
« Reply #189 on: July 15, 2016, 02:33:06 pm »
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We wouldn't assume it in all cases, but it is very common for equations to be expressed with everything on the left hand side equal to zero, called the general form. So that's how nerd1 interpreted it above  ;D

So if it's an equation like graph x+3 then would it be x+3=0 or y=x+3 because in the original question there's no y value?

jamonwindeyer

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Re: Mathematics Question Thread
« Reply #190 on: July 15, 2016, 02:34:28 pm »
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So if it's an equation like graph x+3 then would it be x+3=0 or y=x+3 because in the original question there's no y value?

The question itself is flawed, they'd say which, but I'd interpret it as y=x+3 in that case  :)

conic curve

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Re: Mathematics Question Thread
« Reply #191 on: July 15, 2016, 03:12:37 pm »
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The question itself is flawed, they'd say which, but I'd interpret it as y=x+3 in that case  :)

What if it was y+3?

EEEEEEP

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Re: Mathematics Question Thread
« Reply #192 on: July 15, 2016, 03:23:20 pm »
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Edit: nvm.
« Last Edit: October 15, 2017, 04:57:07 pm by EEEEEEP »

RuiAce

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Re: Mathematics Question Thread
« Reply #193 on: July 15, 2016, 04:05:16 pm »
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@conic

Let's just clear one thing up. If in the exam they wanted you to graph, something is always EQUAL to something.

Otherwise, as Jamon said, the question is flawed.

conic curve

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Re: Mathematics Question Thread
« Reply #194 on: July 15, 2016, 04:38:55 pm »
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@conic

Let's just clear one thing up. If in the exam they wanted you to graph, something is always EQUAL to something.

Otherwise, as Jamon said, the question is flawed.

Oh okay. I just tend to freak out at these questions because I've seen them in the past and don't know how to graph it