anonymous
  • anonymous
The slope-intercept equation of the line through the points (8,4) and (9,4) is y = mx+b what is M ? and what is B ?
Mathematics
schrodinger
  • schrodinger
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nowhereman
  • nowhereman
Insert those two points as (x,y) and solve the resulting system of linear equations for m and b.
anonymous
  • anonymous
im not sure how to get it, i got 4 for b , but how do i get m?
nowhereman
  • nowhereman
Solve the equation after you insert any point and 4 for b.

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anonymous
  • anonymous
you can get m by subtracting y1 from y2 over x1 from x2
anonymous
  • anonymous
ok thanks
amistre64
  • amistre64
you get b AFTER you get the slope
amistre64
  • amistre64
ack!! that and it a straight line by the coordinates lol
amistre64
  • amistre64
the slope of a horizontal line is 0... so the equation is: y = 0x +4 y = 4
anonymous
  • anonymous
ok that makes sense, so m=0
amistre64
  • amistre64
yes, m=0 :)
anonymous
  • anonymous
ok so how would i do this one, (5.1,-2.3) and (-3.5,3.7) . whats the first thing i should do?
amistre64
  • amistre64
first thing is to figure out the slope.. slope is defined by how steep the line rises. y1 -y2 slope = ------- x1 -x2
amistre64
  • amistre64
-2.3 - (3.7) ---------- 5.1 -(-3.5)
amistre64
  • amistre64
-6 --- is what I get if I added it right :) 8.6
anonymous
  • anonymous
ok, yea thats right
amistre64
  • amistre64
we can reduse that to make it easier to see: -6/8.6 = -60/86 = -30/43
anonymous
  • anonymous
ok
amistre64
  • amistre64
now stick that slope into your equation for the line: y = mx + b y = (-30/43)x + b
anonymous
  • anonymous
ok thanks that makes more sense
amistre64
  • amistre64
pick any of the points they gave you and stick them in for x and y (x =-3.5, y=3.7) 3.7 = (-30/43)(-3.5) + b now solve for b
anonymous
  • anonymous
ok thanks!!
amistre64
  • amistre64
youre welcome.
anonymous
  • anonymous
m is the slope and b is the y intercept, i.e the point lying on y axis

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