anonymous
  • anonymous
Which is the equation to the line passing through points (2, -7) and (5, -1)?
Mathematics
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anonymous
  • anonymous
Which is the equation to the line passing through points (2, -7) and (5, -1)?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
y = 2x - 8 y = - 2x + 9 y = 2x - 11 y = - 2x + 6
anonymous
  • anonymous
those are the answers.
hartnn
  • hartnn
do u know how to find slope when 2 points are given ?

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anonymous
  • anonymous
No
hartnn
  • hartnn
The slope of the line through points (x1,y1) and (x2,y2) is given by : \(\huge m=\frac{y_1-y_2}{x_1-x_2}\) now,just put the values and find m.
hartnn
  • hartnn
could u find m=... ?
anonymous
  • anonymous
No, im having a difficult time, i think its due to the early-ness. haha
hartnn
  • hartnn
\(\huge m=\frac{y_1-y_2}{x_1-x_2}=\frac{-7-(-1)}{2-5}=...?\)
anonymous
  • anonymous
-6/-3
hartnn
  • hartnn
m= -6/-3 = ..... ?
Kainui
  • Kainui
It might be easier if you have a graphing calculator. Make a line that looks like: y=(2/3)x and then change the slope around a bit to figure it out and see why the slope is rise/run by going to the "trace" option on your calculator and trying things out, like when x=3.
anonymous
  • anonymous
2
hartnn
  • hartnn
yes, m=2
Compassionate
  • Compassionate
Now use the first points given and the slope. Plug it into the equation: y - y1 = m(x - x1)
hartnn
  • hartnn
now take any point, say (5,-1) and put it in y - y1 = m(x - x1)
hartnn
  • hartnn
x1=5,m=2,y1=-1 isolate y
anonymous
  • anonymous
-_-
Compassionate
  • Compassionate
Tina, let me make it easier for you. y - y1 = m(x - x1) y - (-1) = 2(x - 5) <-- Solve for y
anonymous
  • anonymous
Good lord this is terrible. I feel so confused.
Compassionate
  • Compassionate
Okay. What are you confused with?
anonymous
  • anonymous
Nothing. I think i'm going to skip this! I have to have it done by later tonight. I think im going to rest now haha thanks though:)
Compassionate
  • Compassionate
Bye.

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