What is the equation of the line that passes through the points (-2, 1) and (1, 10)?

Question

anonymous · Answer

I'm starting to feel this line pass two points question comes every minute here :)

anonymous · Answer

the equation is y-y1/x-x1=m. where m is the slope .. and m =y2-y1/x2-x1

anonymous · Answer

haha well i just don't get which formula to use

hero · Answer

Insert each point into the formula y = mx + b:
1 = -2m + b
10 = m + b

Isolate b in each equation:
b = 1 + 2m
b = 10 - m

Set b = b

1 + 2m = 10 - m

solve for m

2m + m = 10 - 1
3m = 9
  m = 9/3
  m = 3

Find b:

b = 1 + 2m
b = 1 + 2(3)
b = 1 + 6
b = 7

Therefore
y = 3x + 7

hero · Answer

You only need to remember one formula for this: y = mx + b

anonymous · Answer

okay .. m=10-1/1+3..

anonymous · Answer

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