If CD=10, and C(4,-3) and D(x,5). Find the values of X.
PLEASE HELP! SO CONFUSED!
2006-10-02 14:43:56 · 4 answers · asked by kay 2 in Education & Reference ➔ Homework Help
use the distance formula
hold on...
x = -10 or 2
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2006-10-02 14:48:57 · answer #1 · answered by sunday girl 6 · 0⤊ 0⤋
To understand this, take a graph paper and plot the point....
Plot where C would be. X=4 and Y=-3. It will be in the somewhere in the 4th quadrant.
Now, you only know the Y cordinate for the point D. Write in the dotted line where y=5. It will be a horizontal line above the X axis.
Now, take a string (or something that is 10 units long). Fix one side to X and start sliding the other side over the dotted line you made earlier.
Where the end of the string (10 units) meets the dotted line exactly, read off the X coordinate. Be careful... There are more than one possibilities.
You'll notice, you now have a right triangle, if you draw a line streight up from point C towards the dotted line. Think of a formula you can use to figure out the distance, and how you can use the information you already have to make it work.
2006-10-02 22:03:57 · answer #2 · answered by tkquestion 7 · 0⤊ 0⤋
Using the distance formula...
sqrt(x-4)^2+(5--3)^2=10
(x-4)^2+(5--3)^2=100
x^2+16+64=100
x^2+80=100
x^2=20
x is about 4
2006-10-02 21:56:00 · answer #3 · answered by ViCKi!™|` 5 · 0⤊ 0⤋
Simple equation my friend. It's (4+-3) x (x+5)=10. Then solve it.
2006-10-02 21:50:37 · answer #4 · answered by Matt T 2 · 0⤊ 0⤋