tinaballerina
Which is the equation to the line passing through points (2, -7) and (5, -1)?
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tinaballerina
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y = 2x - 8
y = - 2x + 9
y = 2x - 11
y = - 2x + 6
tinaballerina
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those are the answers.
hartnn
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do u know how to find slope when 2 points are given ?
tinaballerina
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No
hartnn
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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
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could u find m=... ?
tinaballerina
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No, im having a difficult time, i think its due to the early-ness. haha
hartnn
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\(\huge m=\frac{y_1-y_2}{x_1-x_2}=\frac{-7-(-1)}{2-5}=...?\)
tinaballerina
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-6/-3
hartnn
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m= -6/-3 = ..... ?
Kainui
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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.
tinaballerina
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2
hartnn
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yes, m=2
Compassionate
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Now use the first points given and the slope. Plug it into the equation:
y - y1 = m(x - x1)
hartnn
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now take any point, say (5,-1)
and put it in y - y1 = m(x - x1)
hartnn
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x1=5,m=2,y1=-1
isolate y
tinaballerina
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-_-
Compassionate
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Tina, let me make it easier for you.
y - y1 = m(x - x1)
y - (-1) = 2(x - 5) <-- Solve for y
tinaballerina
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Good lord this is terrible. I feel so confused.
Compassionate
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Okay. What are you confused with?
tinaballerina
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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
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Bye.