please help with my daughters studying.

[moijk]

Seriously, just show her wolfram alpha. don't hide the good stuff away.

http://www.wolframalpha.com/input/?i=y+=+3x,+y+=+x,+y+=+1/2+x,+y+=+2x++5,+y+=+4x++2,+y+=+2x++4

It is like.. magic..

(it does everything else too, and let you in on how it solves it too). I used it to check my answers and if I was lost.

 

[status]

Seriously, just show her wolfram alpha. don't hide the good stuff away.

http://www.wolframalpha.com/input/?i=y+=+3x,+y+=+x,+y+=+1/2+x,+y+=+2x++5,+y+=+4x++2,+y+=+2x++4

It is like.. magic..

(it does everything else too, and let you in on how it solves it too). I used it to check my answers and if I was lost.

"calculate the mass of the sun"

Also : http://www.wolframalpha.com/examples/

 

[Harrison]

We never enountered anything like this at GCSE level in my day. Only once I did A-Level maths did this type of question arise.

BTW, in A-Level we were quickly taught how to do rough graphs without needing to plot anything. Was a very useful tool to learn, but I've not used it much in years and recently looking back at my Pure Maths books I can't remember a lot of it these days.

 

[Merlin]

You can solve the questions without drawing the graphs. (Anything to avoid drawing graphs! )

They're all of the form

y = mx + c

The steepest graph is represented by the largest value of m, so in this case is y = 4x + 2.

You can identify graphs that will run parallel with each other if they have the same value of m, so in this case y = 2x + 5 and y = 2x +4 will run parallel to each other.

Ahh, gradients and intercepts... how I remember thee... *nostalgic*

I still remember the formula for solving quadratic equations:-

y= x + or - the squared root of (b squared - 4ac)/2a

 

[robinsonb5]

I still remember the formula for solving quadratic equations:-

y= x + or - the squared root of (b squared - 4ac)/2a

<pedant>So close!
x=(-b + or - square root(b squared - 4ac))/2a
</pedant>

 

[Harrison]

That formula brings back memories. Very sad, but I used to love quadratic equations, and solving simultaneous equations. The amount of paper needed to solve some of them was mad.

Sent from my Nexus 7 using Tapatalk HD

 

[status]

That formula brings back memories. Very sad, but I used to love quadratic equations, and solving simultaneous equations. The amount of paper needed to solve some of them was mad.

Sent from my Nexus 7 using Tapatalk HD

As much as i love math i used to hate them, the quadratic equations, until I learned about imaginary numbers!

 

[Merlin]

I still remember the formula for solving quadratic equations:-

y= x + or - the squared root of (b squared - 4ac)/2a

<pedant>So close!
x=(-b + or - square root(b squared - 4ac))/2a
</pedant>

Well, it was over 30 years ago and I wasn't going to cheat by using a search engine. Ho hum...

 

[Merlin]

Seriously, just show her wolfram alpha. don't hide the good stuff away.

http://www.wolframalpha.com/input/?i=y+=+3x,+y+=+x,+y+=+1/2+x,+y+=+2x++5,+y+=+4x++2,+y+=+2x++4

It is like.. magic..

(it does everything else too, and let you in on how it solves it too). I used it to check my answers and if I was lost.

"What is the answer to life, the Universe and everything?"

The answer better hadn't be 42!!

 

[roy_bates]

calculating the mass of the sun is a fun one(just dont try to tell me that silly joke about apples being subtracted)

 

[Chinners]

Seriously, just show her wolfram alpha. don't hide the good stuff away.

http://www.wolframalpha.com/input/?i=y+=+3x,+y+=+x,+y+=+1/2+x,+y+=+2x++5,+y+=+4x++2,+y+=+2x++4

It is like.. magic..

(it does everything else too, and let you in on how it solves it too). I used it to check my answers and if I was lost.

"What is the answer to life, the Universe and everything?"

The answer better hadn't be 42!!

42 may be the answer. The true problem is what us the question...