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

You are not logged in.

- Topics: Active | Unanswered

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

CG # 1

Find the area of the triangle whose vertices are

(2, -3), (-1, 3) and (4, 7).

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

**Online**

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

21

IPBLE: Increasing Performance By Lowering Expectations.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

**Online**

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

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

IPBLE: Increasing Performance By Lowering Expectations.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

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 is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

**Online**

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

{3,4}?

IPBLE: Increasing Performance By Lowering Expectations.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

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

**Online**

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

(9,6)?

Why did the vector cross the road?

It wanted to be normal.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

Correct, mathsyperson!

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

CG # 3

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

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

**Online**

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

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

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

You're correct, Patrick! Well done!

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

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.

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

**Online**

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

El que pega primero pega dos veces.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

They are the only equations for which the conditions work

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

CG # 5

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

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

**Online**

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

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

*Excellent, Dionysus! *

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

CG # 6

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

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

CG # 7

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

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

**Online**

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

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

**Online**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

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.

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

**Online**

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

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

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,164

**Very good, mathsyperson!**

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

**Online**