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anonymous

  • 5 years ago

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 ?

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  1. nowhereman
    • 5 years ago
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    Insert those two points as (x,y) and solve the resulting system of linear equations for m and b.

  2. anonymous
    • 5 years ago
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    im not sure how to get it, i got 4 for b , but how do i get m?

  3. nowhereman
    • 5 years ago
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    Solve the equation after you insert any point and 4 for b.

  4. anonymous
    • 5 years ago
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    you can get m by subtracting y1 from y2 over x1 from x2

  5. anonymous
    • 5 years ago
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    ok thanks

  6. amistre64
    • 5 years ago
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    you get b AFTER you get the slope

  7. amistre64
    • 5 years ago
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    ack!! that and it a straight line by the coordinates lol

  8. amistre64
    • 5 years ago
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    the slope of a horizontal line is 0... so the equation is: y = 0x +4 y = 4

  9. anonymous
    • 5 years ago
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    ok that makes sense, so m=0

  10. amistre64
    • 5 years ago
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    yes, m=0 :)

  11. anonymous
    • 5 years ago
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    ok so how would i do this one, (5.1,-2.3) and (-3.5,3.7) . whats the first thing i should do?

  12. amistre64
    • 5 years ago
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    first thing is to figure out the slope.. slope is defined by how steep the line rises. y1 -y2 slope = ------- x1 -x2

  13. amistre64
    • 5 years ago
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    -2.3 - (3.7) ---------- 5.1 -(-3.5)

  14. amistre64
    • 5 years ago
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    -6 --- is what I get if I added it right :) 8.6

  15. anonymous
    • 5 years ago
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    ok, yea thats right

  16. amistre64
    • 5 years ago
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    we can reduse that to make it easier to see: -6/8.6 = -60/86 = -30/43

  17. anonymous
    • 5 years ago
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    ok

  18. amistre64
    • 5 years ago
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    now stick that slope into your equation for the line: y = mx + b y = (-30/43)x + b

  19. anonymous
    • 5 years ago
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    ok thanks that makes more sense

  20. amistre64
    • 5 years ago
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    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

  21. anonymous
    • 5 years ago
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    ok thanks!!

  22. amistre64
    • 5 years ago
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    youre welcome.

  23. anonymous
    • 5 years ago
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    m is the slope and b is the y intercept, i.e the point lying on y axis

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