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#1 2008-06-16 06:59:10
- JoeThinker1
- Member
- Registered: 2008-06-16
- Posts: 1
Writing linear function from a graph
The question is find : (5,8) and (4,3), these are points on a graph (x,y). You first must find the slope first, the slope is 5/1 or just 5. Now, I need to write the function this is where I have the problem. y - ysubscript1 = m(x - xsubscript1) is the formula ysubscript1 = 8 and xsubscript1 = 5. I hope someone can help me with this problem. The answer is y = (x) = 5x - 17 but I don't understand how the 17 got there please help. I hope I explained this in a good way if you need me to try to explain it better please ask.
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#2 2008-06-16 07:01:39
- Daniel123
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- Registered: 2007-05-23
- Posts: 663
Re: Writing linear function from a graph
Alternatively, rather than having to calculate the gradient seperately, you could also use:
Last edited by Daniel123 (2008-06-16 07:18:57)
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#3 2008-06-16 07:05:12
- JoeThinker1
- Member
- Registered: 2008-06-16
- Posts: 1
Re: Writing linear function from a graph
Thank god for you 
Sometimes the silliest things hold my brain up.
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