Math Is Fun Forum

nycguitarguy

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 566

Find Coordinates of Point B

Plot the points A = (-1, 8) and M = (2, 3) in the xy-plane. If M is the midpoint of a line segment AB, find the coordinates of B.

---

The Rapture is the central event in biblical prophecy. The greatest truth about the Rapture is not its timing but it's reality. The Rapture will be the great disappearance.

Dr. David Jeremiah

Bob

Administrator

Registered: 2010-06-20

Posts: 10,208

Re: Find Coordinates of Point B

Use the same vector method in the previous post.

B

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

nycguitarguy

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 566

Re: Find Coordinates of Point B

Use the same vector method in the previous post.

B

I don't know the vector method. I haven't played around with vectors in over a decade.

Plot the points A = (-1, 8) and M = (2, 3) in the xy-plane. If M is the midpoint of a line segment AB, find the coordinates of B.

I know the distance from A to M = M to B.

Can the distance formula be used?

---

The Rapture is the central event in biblical prophecy. The greatest truth about the Rapture is not its timing but it's reality. The Rapture will be the great disappearance.

Dr. David Jeremiah

Bob

Administrator

Registered: 2010-06-20

Posts: 10,208

Re: Find Coordinates of Point B

Distance would be hard because you don't know the direction. I've given two ways in the other post.

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

amnkb

Member

Registered: 2023-09-19

Posts: 253

Re: Find Coordinates of Point B

Plot the points A = (-1, 8) and M = (2, 3) in the xy-plane. If M is the midpoint of a line segment AB, find the coordinates of B.

just plug into midpoint formjula

Set the x and y coords equal

Solve for x and y

nycguitarguy

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 566

Re: Find Coordinates of Point B

Plot the points A = (-1, 8) and M = (2, 3) in the xy-plane. If M is the midpoint of a line segment AB, find the coordinates of B.

just plug into midpoint formjula

Set the x and y coords equal

Solve for x and y

You are so kind.

(x + 1)/2 = 2

x + 1 = 2(2)

x + 1 = 4

x = 4 - 1

x = 3

(y - 8)/2 = 3

y - 8 = 6

y = 14

So, point B = (3, 14).

Yes?

Last edited by nycguitarguy (2024-03-23 02:26:28)

---

The Rapture is the central event in biblical prophecy. The greatest truth about the Rapture is not its timing but it's reality. The Rapture will be the great disappearance.

Dr. David Jeremiah

Bob

Administrator

Registered: 2010-06-20

Posts: 10,208

Re: Find Coordinates of Point B

(x + 1)/2 = 2

x + 1 = 2

x = 1

line 2 should be x + 1 = 4

14 is right.

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

nycguitarguy

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 566

Re: Find Coordinates of Point B

(x + 1)/2 = 2

x + 1 = 2

x = 1

line 2 should be x + 1 = 4

14 is right.

Bob

I edited my post.

Point B = (3, 14).

Last edited by nycguitarguy (2024-03-23 02:27:13)

---

The Rapture is the central event in biblical prophecy. The greatest truth about the Rapture is not its timing but it's reality. The Rapture will be the great disappearance.

Dr. David Jeremiah