# Math Help - Need help!

1. ## Need help!

this is probably easy but i cant get my head around it.

the points Q(1,3) and R(7,0) lie on line L1
the length of QR is a√5

fidn the value of a

2. Originally Posted by edwards2779
this is probably easy but i cant get my head around it.

the points Q(1,3) and R(7,0) lie on line L1
the length of QR is a√5

fidn the value of a
$a^2 + b^2 = c^2$

3. Originally Posted by Jason Bourne
$a^2 + b^2 = c^2$
sorry but that hasn't helped me at all, i know what pythagoras theorem is but i can't see how it helps with this situation because i dont know any lengths

Edit: sorry agen about 2 seconds after i posted last it hit me, thanks for help eniway

4. 3

5. you can find the distance by taking the square root of (x-x)^2+(y-y)^2