Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

Login

Username

Password

Not registered yet?

  • Index
  •  » Help Me !
  •  » Help me Find Two Points from this Problem and Show your Work!

Post a reply

Go back

Write your message and submit
:) :| :( :D :o ;) :/ :P :lol: :mad: :rolleyes: :cool: | :dizzy :eek :kiss :roflol :rolleyes :shame :down :up :touched :sleep :wave :swear :tongue :what :faint :dunno
Options

Go back

Topic review (newest first)

bob bundy
2012-08-02 16:47:23

You're welcome.

Bob

SlowlyFading
2012-08-02 04:15:41

Thanks!

bob bundy
2012-08-01 03:36:02

see below

Bob

SlowlyFading
2012-08-01 02:17:09

And, how exactly do you graph points like that?

SlowlyFading
2012-07-31 02:29:30

Okay! Thanks. <3

debjit625
2012-07-31 02:23:23

SlowlyFading  wrote:

The (3, -1) is the point.

This point can't be from the equation

,let substitute the values of x and y in the equation


debjit625
2012-07-31 02:17:52

I think you have one equation and solving it will be like this


Let y be 2

Subtract 2 from both the sides


So your point will be

Now let x be 2

Subtract 2 from both the sides


So your point will be


Normally we use intercept to find any two points of a straight line  i.e... take x as 0 and solve for the equation and then take y as 0 and solve the equation.
If you take x as 0 then y will be 3
and if you take y as 0 then x will be 3


Good Luck

bobbym
2012-07-31 02:15:01

Hi;

It is certainly not on x + y = 3.

SlowlyFading
2012-07-31 02:11:26

The (3, -1) is the point.

bobbym
2012-07-31 01:42:19

Hi;

What is (3, -1)?

SlowlyFading
2012-07-31 01:20:52

Thanks guys!

How does this work:
x + y = 3
x + 2 = 3
-2 -2

-1/1
(3, -1)

It's the only one I'm not sure about..

debjit625
2012-07-28 18:33:58

SlowlyFading  wrote:

15/4
I got 3.75, so I rounded that up to 4.
(4, 0)

These coordinates or points are from cartesian coordinate system,they all have different meanings,you just cant change it a bit ,if you do the whole system will go wrong...
In short never round up any point of any coordinate,if the answer is in fraction keep it in fraction
So in this case your coordinate will be


SlowlyFading  wrote:

I don't think any of the work is wrong but the problem is only one point was found for each equation. I need 2 points from each equation.

Like you picked 2 for x ,just pick any other number for x you will get another point.

Good Luck

bob bundy
2012-07-28 03:55:50

hi SlowlyFading

Your working to get (2,4) and (2,1) is all correct.  smile  If you want more points, just choose another value for x, and work out the y values as you have done.

(0,-5) is correct for the first question.

(4,0) is not correct.

Every thing was correct up to

4x = -15

Then it went wrong.  sad

The x coordinate should have been negative.

And I would not have rounded it at all.  When you come to draw the graph, the line will not be in the right place.

Bob

SlowlyFading
2012-07-28 03:12:47

y = 2x,   x + y = 3

Actually, I'm not exactly sure what's wrong with the problem above. Is there even a problem with that one? Do I need more points? sad

SlowlyFading
2012-07-28 03:06:28

I need help finding 2 points from these equations. I tried solving them myself (My work is below) but it was wrong. So I need the correct answers and please show your work. Thank you!

I need help with this one: 4x + 3y = -15

My work for it:
4x + 3y = -15
4(0) + 3y = -15
0 + 3y = -15
3y = -15

-15/3
(0, -5)

4x + 3y = -15
4x + 3(0) = -15
4x + 0 = -15
4x = -15

-15/4
I got 3.75, so I rounded that up to 4.
(4, 0)

The points are (0, -5) and (4, 0)

The Equations: y = 2x,   x + y = 3

y = 2x
y = 2(2)
y = 4

(2, 4)


x + y = 3

First I picked 2 for x.

2 + y = 3

If we subtract 2 from both sides of the equation we will get y by itself.

2 - 2 + y = 3 - 2

2 - 2 = 0 so the left hand side becomes

0 + y = 3 - 2

Now y + 0 is the same as y so the left hand side becomes

y = 3 - 2

Now 3 - 2 = 1 so the right side becomes

y = 1

(2, 1)

I don't think any of the work is wrong but the problem is only one point was found for each equation. I need 2 points from each equation.

Board footer

Powered by FluxBB