P(5, 7), Q(-10, -1)

Question

P(5, 7), Q(-10, -1)

anonymous · Answer

are you trying to find the slope ?

e.mccormick · Answer

Or a vector between?  Lots of possibilities with two points.

anonymous · Answer

it's a question ..can you help me to solve that question ?

anonymous · Answer

but you not asking anything :(

anonymous · Answer

but the question in my book just write it like that ..and I don't even understand what the question want ..

anonymous · Answer

are you in a chapter of lines ? vectors?

e.mccormick · Answer

What is above the question in the book?  For these...  something like that.

anonymous · Answer

the question is .. 'Find the distance of PQ using Pythagoras' theorem .. P(5, 7), Q(-10, -1)

anonymous · Answer

how to solve it ?

e.mccormick · Answer

OK.  There we are.  Know the distance formula?

anonymous · Answer

yes ..

e.mccormick · Answer

That is what you want to use here.  The distance formula is based on Pythagoras' theorem

anonymous · Answer

oohh ..okay ..but ..actually I've forget the formula ..

e.mccormick · Answer

$\Large D=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$

anonymous · Answer

ohh ..okay ..hang on ,, I wanna try to solve the question ..

anonymous · Answer

ugh ..still can't solve it ..
huhuhu

e.mccormick · Answer

Well, what did you put where?

anonymous · Answer

I got the answer 9.21 .. is that true ?

e.mccormick · Answer

Hmmm....  not sure how you got that.

anonymous · Answer

i really stress just because of this question ..

e.mccormick · Answer

P(5, 7), Q(-10, -1)

Let me change my distance formula a little.  If I say P is the first equation and Q is the second, it becomes:

$\Large D=\sqrt{(x_P-x_Q)^2+(y_P-y_Q)^2}$

So, you take the x from the first equation and subtract the x from the second equation.  HOWEVER!!!  Be careful of the sign!  -(-10) means +10!!!

e.mccormick · Answer

Then do the same thing with the y side.  Then square them.  Then add those squares.  Finally, take the root of all of that.

anonymous · Answer

hang on .i try ..

e.mccormick · Answer

=)  OK!

anonymous · Answer

thanks ..I got 17 .is that true ?

e.mccormick · Answer

That is what I got too.  =)  Much better.  Do you see what your mistake was?  If so, good.  Lets you know something to watch out for next time!

anonymous · Answer

thank you very much for your help .. :)

e.mccormick · Answer

no problem.  Have fun!