SOLUTION: Write an equation in point-slope form for the line through the given points or through the given point with the given slope. (1,2), (3,8)

Question 262751: Write an equation in point-slope form for the line through the given points or through the given point with the given slope. (1,2), (3,8)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Do it like this:
You show 2 points, no slope.
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Given 2 points example. Points (2,1) and (3,5)
This is a 2 step process. First find the slope of the line thru the points.
slope, m = diffy/diffx
m = (5-1)/(3-2)
m = 4
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Now use y = mx + b with either point to find b, the y-intercept.
y = mx + b
5 = 4*3 + b
b = -7
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y = mx + b
y = 4x - 7 is the answer.
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