How do I use the midpoint formula to find the coordinates of point C?

In summary, the coordinates of point C can be found by using the midpoint formula, which gives us two equations to solve for the values of x and y.
  • #1
mathdad
1,283
1
The coordinates of A and B are A(-1, 2) and B(5, -3). If B is the midpoint of line segment AC, what are the coordinates of C?

I know this question is connected to the midpoint formula. If so, how do I use the formula to find the x and y coordinates of C?
 
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  • #2
Let's label the coordinates of point $C$ as $(x,y)$...then (as you correctly surmised), the mid-point formula gives us (since $B$ is said to be the mid-point of $\overline{AC}$):

\(\displaystyle \left(\frac{-1+x}{2},\frac{2+y}{2}\right)=(5,-3)\)

This gives us 2 equations:

\(\displaystyle \frac{-1+x}{2}=5\)

\(\displaystyle \frac{2+y}{2}=-3\)

Solving each will give you the values of $x$ and $y$. :D
 
  • #3
MarkFL said:
Let's label the coordinates of point $C$ as $(x,y)$...then (as you correctly surmised), the mid-point formula gives us (since $B$ is said to be the mid-point of $\overline{AC}$):

\(\displaystyle \left(\frac{-1+x}{2},\frac{2+y}{2}\right)=(5,-3)\)

This gives us 2 equations:

\(\displaystyle \frac{-1+x}{2}=5\)

\(\displaystyle \frac{2+y}{2}=-3\)

Solving each will give you the values of $x$ and $y$. :D

I knew this would lead to two equations. Thank you for your help.
 

FAQ: How do I use the midpoint formula to find the coordinates of point C?

What is the definition of "Coordinates of Point C"?

The coordinates of Point C refer to the set of numbers that uniquely identify the location of Point C in a specific coordinate system. These coordinates are usually in the form of (x,y) or (latitude, longitude).

How do you determine the coordinates of Point C on a graph?

To determine the coordinates of Point C on a graph, you need to identify the x and y axes and then find the intersection point of the vertical and horizontal lines that pass through Point C. The x-coordinate is the number on the horizontal axis and the y-coordinate is the number on the vertical axis at the intersection point.

Can the coordinates of Point C be negative?

Yes, the coordinates of Point C can be negative depending on the coordinate system being used. In a Cartesian coordinate system, the x and y axes can have both positive and negative values, while in a polar coordinate system, only the radial distance can be negative.

How are the coordinates of Point C useful in navigation?

The coordinates of Point C are essential in navigation as they provide a precise location of Point C on a map or a GPS device. This allows for accurate navigation and tracking of movement, whether on land, sea, or air.

Are the coordinates of Point C the same in all coordinate systems?

No, the coordinates of Point C can vary depending on the coordinate system being used. For example, in a three-dimensional Cartesian coordinate system, Point C would have three coordinates (x, y, z), while in a two-dimensional polar coordinate system, Point C would have two coordinates (r, θ).

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