moongazer
  • moongazer
The distance of point (-1, 4) and the line 4x – 2y = 4 is ___.
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
8/sqart 5
moongazer
  • moongazer
how did you do it?
anonymous
  • anonymous
\[8/\sqrt{5}\]

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moongazer
  • moongazer
how?
moongazer
  • moongazer
Please explain.
anonymous
  • anonymous
wait, wait
anonymous
  • anonymous
4x-2y-4=0 put the values of x and y in the LHS then take the modulus of that value and divide it by sqrt of sum of the squares of coeffients of x and y. i think, u know the proof why we do that
anonymous
  • anonymous
sorry, co-efficients ^^
moongazer
  • moongazer
Sorry but I didn't get it.
amistre64
  • amistre64
since the distance from a point to a line is along a perpendiular line; if we can construct a perpendicular line equation that goes thru the given point we can use a system of equations to determine the point where they meet. then use the distance formula to determine the distance from the meeting point and the given point.
amistre64
  • amistre64
|dw:1326977726363:dw|
amistre64
  • amistre64
one trick to a perp line is to swap coeffs and negate one of them: 4x – 2y = 4 perp line: 2x + 4y = n calibrate with the given point (-1,4): 2(-1) + 4(4) = n -2 + 16 = n = 14 perp line: 2x + 4y = 14
amistre64
  • amistre64
system of equations gives us: 4x - 2y = 4 2x + 4y = 14 ; *-2 4x - 2y = 4 -4x -8y = -28 ------------ -10y = -24 y = 24/10 = 12/5 .............................................. 4x - 2y = 4 ;*2 2x + 4y = 14 8x - 4y = 8 2x + 4y = 14 ------------ 10x = 22 x = 22/10 = 11/5 ................................ we want the distance from (-1,4) to (12/5, 11/5) if i did that right
moongazer
  • moongazer
I think this is the explanation that I am looking for.
moongazer
  • moongazer
could I use the formula d=(/Ax1+By1+C/)/sqrtof(a^2+B^2) I think this is the formula for this. :)
amistre64
  • amistre64
\[dist.=\sqrt{a^2+b^2}\] is a compact form of the distance formula yes; personally I just subtract the points, square them, add them and sqrt them
amistre64
  • amistre64
( 12/5, 11/5) - ( -5/5, 20/5) --------------- (17/5 , -9/5) ^2 (289+81)/25 sqrt(370)/5
amistre64
  • amistre64
that should simplify to 8/sqrt(5)
amistre64
  • amistre64
but then some texts hate a sqrt in the denom; so maybe we rewrite it: \(cfrac{8}{5}\sqrt{5}\)
amistre64
  • amistre64
well that dint format good on my screen lol
amistre64
  • amistre64
\[\frac{8\sqrt{5}}{5}\] or \[\frac{8}{5}\sqrt{5}\]
moongazer
  • moongazer
\[ d= (\left| Ax _{1}+Bx _{2}+C \right|)/\sqrt{A ^{2}+B ^{2}}\] This is what my teacher taught us :)
amistre64
  • amistre64
that might work :) ive never quite seen it like that tho.

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