# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2006-02-27 16:44:14

ganesh
Registered: 2005-06-28
Posts: 40,568

### Coordinate Geometry

CG # 1

Find the area of the triangle whose vertices are
(2, -3), (-1, 3) and (4, 7).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #2 2006-02-27 18:32:13

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

21

IPBLE:  Increasing Performance By Lowering Expectations.

Offline

## #3 2006-02-27 19:45:29

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #4 2006-02-27 20:17:05

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

That was easy. I solved it in Paint for~1min

IPBLE:  Increasing Performance By Lowering Expectations.

Offline

## #5 2006-02-28 16:17:19

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 2

Find (x,y) if (3,2), (6,3), (x,y) and (6,5) are the vertices of a parellologram taken in order.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #6 2006-02-28 17:59:51

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

{3,4}?

IPBLE:  Increasing Performance By Lowering Expectations.

Offline

## #7 2006-02-28 19:41:06

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #8 2006-03-01 03:37:59

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Coordinate Geometry

(9,6)?

Why did the vector cross the road?
It wanted to be normal.

Offline

## #9 2006-03-01 03:46:38

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

Correct, mathsyperson!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #10 2006-03-01 04:00:29

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 3

If 3x-2y+4=0 and ax+4y+3=0 are parallel lines, find the value of a.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #11 2006-03-01 06:17:02

Patrick
Real Member
Registered: 2006-02-24
Posts: 1,005

### Re: Coordinate Geometry

CG# 3
a = -6?

Last edited by Patrick (2006-03-01 06:17:20)

Support MathsIsFun.com by clicking on the banners.
What music do I listen to? Clicky click

Offline

## #12 2006-03-01 15:59:53

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

You're correct, Patrick! Well done!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #13 2006-03-01 16:13:04

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 4

Find the equations of the lines which pass through the point (3,4) and make intercepts on the axes such that their sum is 14.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #14 2006-03-01 18:08:18

ryos
Member
Registered: 2005-08-04
Posts: 394

### Re: Coordinate Geometry

El que pega primero pega dos veces.

Offline

## #15 2006-03-01 18:25:24

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

They are the only equations for which the conditions work

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #16 2006-03-02 17:39:04

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 5

Find the equation of the perpendicular bisector of the line joining the points A(-1,2) and B(3,-4).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #17 2006-03-06 16:22:15

Dionysus
Member
Registered: 2006-03-06
Posts: 9

### Re: Coordinate Geometry

Last edited by Dionysus (2006-03-06 16:22:49)

Offline

## #18 2006-03-06 16:50:37

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

Excellent, Dionysus!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #19 2006-03-06 18:31:40

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 6

Prove that the lines 3x-4y+5=0, 7x-8y+5=0 and 4x+5y=45 are concurrent.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #20 2006-03-08 20:02:03

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 7

Show that the points (4, -4), (-4, 4), and (4√3, 4√3) are the vertices of an equilateral triangle.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #21 2006-03-09 16:50:39

Dionysus
Member
Registered: 2006-03-06
Posts: 9

Offline

## #22 2006-03-10 03:00:46

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #23 2006-03-10 04:27:36

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

CG # 8

Find the equation of the straight line making an angle 135° with the positive direction of x-axis and cutting an intercept 5 on the y-axis.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #24 2006-03-10 04:31:37

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Coordinate Geometry

tan 135° = -1, so that is the gradient of the line. We are told that the y-intercept is 5, so the equation is y = 5-x.

Why did the vector cross the road?
It wanted to be normal.

Offline

## #25 2006-03-10 15:50:29

ganesh
Registered: 2005-06-28
Posts: 40,568

### Re: Coordinate Geometry

Very good, mathsyperson!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline