anonymous
  • anonymous
Write an equation in point-slope form of the line through point J(4, 1) with slope –4.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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AriPotta
  • AriPotta
do you know what point-slope form is?
anonymous
  • anonymous
yes
AriPotta
  • AriPotta
so this should be easy. just substitute the numbers in

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anonymous
  • anonymous
how
anonymous
  • anonymous
give u hard time
anonymous
  • anonymous
sorry
anonymous
  • anonymous
:(
AriPotta
  • AriPotta
tell me what point-slope form is.
anonymous
  • anonymous
tells a difference between two points on a line.
AriPotta
  • AriPotta
what?
anonymous
  • anonymous
The point-slope form expresses the fact that the difference in the y coordinate between two points on a line (that is, y − y1) is proportional to the difference in the x coordinate (that is, x − x1). The proportionality constant is m (the slope of the line).
AriPotta
  • AriPotta
it's y - y1 = m(x - x1) idk if that's what you meant...
AriPotta
  • AriPotta
brb i gotta walk mah dog
anonymous
  • anonymous
at night
anonymous
  • anonymous
im at USA
AriPotta
  • AriPotta
alright i'm back
AriPotta
  • AriPotta
so it should be easy. you're just substituting the y in the coordinate for y1, the x in the coordinate for x1, and -4 for m
anonymous
  • anonymous
so the answer is y - y1 = m(x - x1)
AriPotta
  • AriPotta
no, you didn't substitute
AriPotta
  • AriPotta
our point is (4,1) so x1 is 4 and y1 is 1
anonymous
  • anonymous
y - y1 = m(x - x1) y – 1 = (-4)(x – 4) y - 1 = -4(x - 4) y - 1 = -4x + 16 y = -4x + 16 + 1 y = -4x + 17
AriPotta
  • AriPotta
which one is it then?
anonymous
  • anonymous
y = -4x + 17
anonymous
  • anonymous
STEp by STEp y - y1 = m(x - x1) y – 1 = (-4)(x – 4) y - 1 = -4(x - 4) y - 1 = -4x + 16 y = -4x + 16 + 1 y = -4x + 17
AriPotta
  • AriPotta
i thought the answer was supposed to be in point-slope form
anonymous
  • anonymous
so how can i write y = -4x + 17 to point-slope form
AriPotta
  • AriPotta
lol. it was already in point-slope in step 1. y - 1 = -4(x - 4)
anonymous
  • anonymous
haha never knew that

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