## DustinMHayes Group Title Use the distance formmula to find the distance between point B (-3,-8) and point C (2,4). one year ago one year ago

1. PhoenixFire Group Title

Do you know what the distance formula is?

2. DustinMHayes Group Title

yes but I'm confused as to where to put the numbers in.

3. PhoenixFire Group Title

$d=\sqrt{x^2+y^2}=\sqrt{(x_1-x)^2+(y_1-y)^2}$ You have two points, find the change in x and change in y, and put into the formula.

4. DustinMHayes Group Title

is -3 -8 x1 and y1

5. PhoenixFire Group Title

it shouldn't make a difference since it's squared. But usually if you want to find the distance from B to C, your x1y1=C and xy=B

6. DustinMHayes Group Title

7. PhoenixFire Group Title

$dist=\sqrt{(2+3)^2+(4+8)^2}=\sqrt{25+144}=\sqrt{169}=13$

8. DustinMHayes Group Title

My distance formula says you subtract x 2 and x 1

9. PhoenixFire Group Title

yup. $2-(-3)=2+3=5$

10. PhoenixFire Group Title

$4-(-8)=4+8=12$ Double negative becomes a positive.

11. DustinMHayes Group Title

Ok. Thanks for youre help.