MedVision ad

2016ers Chit-Chat Thread (3 Viewers)

Status
Not open for further replies.

KingOfActing

lukewarm mess
Joined
Oct 31, 2015
Messages
1,016
Location
Sydney
Gender
Male
HSC
2016
I totally used pseudo-"inspection" to save time on 4U today.

It was one of those "Hence prove the the point T is T(..., ...)" which is done through simultaneous equations

I solved for y simultaneously, then just said "Substituting this back into the first equation gives x = [xcoord from question]" rather than actually dealing with the equation twice
 

Nailgun

Cole World
Joined
Jun 14, 2014
Messages
2,193
Gender
Male
HSC
2016
I totally used pseudo-"inspection" to save time on 4U today.

It was one of those "Hence prove the the point T is T(..., ...)" which is done through simultaneous equations

I solved for y simultaneously, then just said "Substituting this back into the first equation gives x = [xcoord from question]" rather than actually dealing with the equation twice
i do that in 2U lel
 

Paradoxica

-insert title here-
Joined
Jun 19, 2014
Messages
2,556
Location
Outside reality
Gender
Male
HSC
2016
I totally used pseudo-"inspection" to save time on 4U today.

It was one of those "Hence prove the the point T is T(..., ...)" which is done through simultaneous equations

I solved for y simultaneously, then just said "Substituting this back into the first equation gives x = [xcoord from question]" rather than actually dealing with the equation twice
usually I consider the quotient and product of the x y co-ordinates... That's most of the "hard" locus questions.

The rest are impossible to see (and hence require magic) and the remaining are usually so obvious that the question can be handwaved in one line.
 

KingOfActing

lukewarm mess
Joined
Oct 31, 2015
Messages
1,016
Location
Sydney
Gender
Male
HSC
2016
usually I consider the quotient and product of the x y co-ordinates... That's most of the "hard" locus questions.

The rest are impossible to see (and hence require magic) and the remaining are usually so obvious that the question can be handwaved in one line.
Oh no it was heaps easy, it's was just to prove that the coordinates were something. I think it was T(2cpq/(p+q), 2c/(p+q)). It was the point of intersection of the tangents at two points on a rectangular hyperbola. In the next part pq was assumed to be some constant (C) and so the locus is y = x/C
 

Green Yoda

Hi Φ
Joined
Mar 28, 2015
Messages
2,859
Gender
Male
HSC
2017
Curious: can I use matrices to solve simultaneous equations in my 2u exam? lel
 

Paradoxica

-insert title here-
Joined
Jun 19, 2014
Messages
2,556
Location
Outside reality
Gender
Male
HSC
2016
Oh no it was heaps easy, it's was just to prove that the coordinates were something. I think it was T(2cpq/(p+q), 2c/(p+q)). It was the point of intersection of the tangents at two points on a rectangular hyperbola. In the next part pq was assumed to be some constant (C) and so the locus is y = x/C
that's so easy I laugh.
 

Paradoxica

-insert title here-
Joined
Jun 19, 2014
Messages
2,556
Location
Outside reality
Gender
Male
HSC
2016
Curious: can I use matrices to solve simultaneous equations in my 2u exam? lel
LOL

I know you can use Matrices to solve problems of the Conic sections in 4U (source: Olympiad tutor)

I'm not sure 2U affords students the same flexibility.
 

leehuan

Well-Known Member
Joined
May 31, 2014
Messages
5,805
Gender
Male
HSC
2015
Curious: can I use matrices to solve simultaneous equations in my 2u exam? lel
Wow gees your simultaneous equations in 2U aren't even hard and you want matrices?!
 

InteGrand

Well-Known Member
Joined
Dec 11, 2014
Messages
6,109
Gender
Male
HSC
N/A
LOL

I know you can use Matrices to solve problems of the Conic sections in 4U (source: Olympiad tutor)

I'm not sure 2U affords students the same flexibility.
Are you sure you're allowed to use matrices for the Conics section in HSC? Because that'll really trivialise some of the questions they ask.
 

KingOfActing

lukewarm mess
Joined
Oct 31, 2015
Messages
1,016
Location
Sydney
Gender
Male
HSC
2016
LOL

I know you can use Matrices to solve problems of the Conic sections in 4U (source: Olympiad tutor)

I'm not sure 2U affords students the same flexibility.
SCREAMS

WHAT

That's so much easier I'm literally sobbing inside I wish I knew this eariler
 
Status
Not open for further replies.

Users Who Are Viewing This Thread (Users: 0, Guests: 3)

Top