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#1 2005-11-20 03:15:38
- tristan1
- Novice
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Straight Line Graph Equations
I have a task where I have to find the equation of ....
A line that passes through (0,7) at a gradient of 3.
* I Think this one is 3x+7*
A line that passes through (2,3) at a gradient of 2.
A line that passes through (4,3) at a gradient of -1.
A line that passes through (2,1) at a gradient of 4,5.
A line that passes through (4,5) and (6,7)
A line that passes through (0,5) at a gradient of (3,2).
#2 2005-11-20 03:44:10
- ryos
- Power Member
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Re: Straight Line Graph Equations
Your first equation is correct. It's in the form y=mx + b, where m is the slope and b is the y-intercept. b was easy to find because it was given to you, but not all problems are so nice. In this case, point-slope form (y = y1 + m(x - x1)) is your friend. So:
y= 3 + 2(x - 2)
y= 3 - (x - 4)
y= 1 + 4.5(x - 2)
etc.
El que pega primero pega dos veces.
#4 2005-11-20 04:07:08
- tristan1
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Re: Straight Line Graph Equations
Please confirm for me these are the final answers and they dont need simplifying...
A line that passes through (0,7) at a gradient of 3 = 3x+7
A line that passes through (2,3) at a gradient of 2 = y= 3 + 2(x - 2)
A line that passes through (4,3) at a gradient of -1 = y= 3 - (x - 4)
#5 2005-11-20 04:10:29
- tristan1
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Re: Straight Line Graph Equations
Sorry for posting again, but I just realized these are the actual questions:
A line that passes through (0,7) at a gradient of 3.
^I Think this one is 3x+7^
A line that passes through (2,3) at a gradient of 2.
A line that passes through (4,3) at a gradient of -1.
A line that passes through (2,1) and (4,5)
A line that passes through (5,4) and (6,7)
A line that passes through (0,5) and (3,2).
Last edited by tristan1 (2005-11-20 04:53:06)