Question

point L is located at (4,-3) and M is located at (-8,5). find the y value of the point that lies halfway between L and M.

A)1.5
b)4
c)3.5
d)1

Answer 1

please help..

Answer 2

Do you know the midpoint formula?

Answer 3

\(\bf \textit{middle point of 2 points }\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
L&({\color{red}{ 4}}\quad ,&{\color{blue}{ -8}})\quad M&({\color{red}{ -3}}\quad ,&{\color{blue}{ 5}})
\end{array}\qquad
\left(\cfrac{{\color{red}{ x_2}} + {\color{red}{ x_1}}}{2}\quad ,\quad \cfrac{{\color{blue}{ y_2}} + {\color{blue}{ y_1}}}{2} \right)\)

Answer 4

yes isnt it m(Xa-Xb/2), (Ya-Yb/2)

Answer 5

hmm,m welll ahemm ok so got the values off =) anyhow \(\bf \textit{middle point of 2 points }\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
L&({\color{red}{ 4}}\quad ,&{\color{blue}{ -3}})\quad M&({\color{red}{ -8}}\quad ,&{\color{blue}{ 5}})
\end{array}\qquad
\left(\cfrac{{\color{red}{ x_2}} + {\color{red}{ x_1}}}{2}\quad ,\quad \cfrac{{\color{blue}{ y_2}} + {\color{blue}{ y_1}}}{2} \right)\)

Answer 6

yes you plug it in... but how does it match any of the answer choices?

Answer 7

Yes it is; just use your coordinates they gave you and find y. You'll get it if you already know the formula! Good for you!

Answer 8

Your y coordinate is one of the choices they gave you. The first coordinate in the parenthesis is the x coordinate and the second coordinate is the y. They want you to identify y, even though using that formula you will also identify x.

Answer 9

so would it be 3.5?

Answer 10

Um...no. Let's do it together.\[(\frac{ -8+(-4) }{ 2 },\frac{ 5+3 }{ 2 })\]That gives us\[(\frac{ -12 }{ 2 },\frac{ 8 }{ 2 })\]Dividing that out we get x is -6 and y is 4. See? Choice B is 4.

Answer 11

ooo ok sorry i get it i typed something wrong in my calculator. thank you so much! i understand now

Answer 12

You're welcome!! Thanks for the medal!!!