SOLUTION: Can you please explain how to use a function table for graphing a linear equation, I have tried, but each time I always mess up. :D Thanks!

Question 809420: Can you please explain how to use a function table for graphing a linear equation, I have tried, but each time I always mess up. :D Thanks!
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
Question:
Can you please explain how to use a function table for graphing a linear equation, I have tried, but each time I always mess up. :D Thanks!
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Assuming that by "function table" you mean something like this:
x y
1 2
2 3
3 4
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which is a list of (x,y) pairs, you would use the two-point form to write the equation for the line, like so:
y - y1 = ( (y2 - y1)/(x2 - x1) ) (x - x1)
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pick any two points from your table and plug into x1,y1 and x2,y2.
note that x1 cannot equal x2. if they do, the line is vertical and the slope is undefined, in which case the equation becomes: x = x1
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Convert fractions, decimals, and percents:
https://sooeet.com/math/fraction-decimal-percent.php
---
Calculate and graph the linear regression of any data set:
https://sooeet.com/math/linear-regression.php
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