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Question 188892: if i give you two points on a graph say (5,20) and (8,29) where do i go if i do
20-29=-9
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5-8=-3 then i do
-9 / -3 getting 3 ok then i make a table knowing that the slope is 3? but then 0 or y intercept is 5 right but then they want me to solve algebra method where do i go next from there? do i make a graph or a rule first? because the rule would be y=5x-3 right?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! if i give you two points on a graph say (5,20) and (8,29) where do i go if i do
20-29=-9
--------
5-8=-3 then i do
-9 / -3 getting 3 ok then i make a table knowing that the slope is 3? but then 0 or y intercept is 5 right but then they want me to solve algebra method where do i go next from there? do i make a graph or a rule first? because the rule would be y=5x-3 right?
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You got the slope, m, right, m = 3.
Then, use either point to get the equation.
y-y1 = m*(x-x1) (x1,y1) is the point.
y-20 = 3*(x-5)
y-20 = 3x-15
y = 3x + 5
The y-intercept is 5, at (0,5).
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Then you can make one more point, and since it's a straight line, draw the line thru them.
Give x any value, and find y.
eg, x = 3, y = 14 --> (3,14)
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