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anonymous

  • one year ago

write an equation in the form y=mx+b for the line which contains the point (6,-8) and (-2,-12)

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  1. anonymous
    • one year ago
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    i need help

  2. MrNood
    • one year ago
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    do you know what the form of the equation y=mx+b means?

  3. anonymous
    • one year ago
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    no i do not

  4. MrNood
    • one year ago
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    so - you are studying straight line equations have you seen the equation y=mx + b before?

  5. anonymous
    • one year ago
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    yes i have but i honestly dont really get it

  6. MrNood
    • one year ago
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    do you know what the slope of a straight line is?

  7. anonymous
    • one year ago
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    are you talking bout the y1,y2/x1,x2

  8. MrNood
    • one year ago
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    yes - that is correct (but it is y1-y2/x1-x2) you can use the 2 points you are given to work out the slope from that equation

  9. MrNood
    • one year ago
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    fill in the numbers - from the points: x1= x2= x1-x2= y1= y2= y1-y2= y1-y2/x1-x2 =

  10. anonymous
    • one year ago
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    ok give me a min im going to do it

  11. anonymous
    • one year ago
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    my answer is 0.5

  12. MrNood
    • one year ago
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    that is good - correct now in the equation y=mx +b the slope is the value m so you can start to make the equation y= 0.5x +b OK so far?

  13. anonymous
    • one year ago
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    so should i make -12 or -8 my y intercept

  14. MrNood
    • one year ago
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    so - don't rush ahead... the equation is y=0.5x+b and you know that the point (6,-8) is on th eline so you can fill in some numbers: -8 = 0.5(6) +b (that is th esame equation but we pput the values from one of the known points in OK? so now you can work out b from that equation...

  15. MrNood
    • one year ago
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    |dw:1433973314791:dw|

  16. anonymous
    • one year ago
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    ok can you tell me how to get b

  17. MrNood
    • one year ago
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    I SHOWED YOU HOW TO PUT TH EVALUES OF ONE OF TH EPOINTS INTO THE EQUATION (oops) to give you this: -8 = 0.5(6) +b so solve that to get a number for b

  18. MrNood
    • one year ago
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    what is 0.5(6) i.e. 0.5 times 6??

  19. anonymous
    • one year ago
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    3

  20. MrNood
    • one year ago
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    so the equation I wrote is -8 = 3 +b so what is b?

  21. anonymous
    • one year ago
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    -11

  22. MrNood
    • one year ago
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    well done - that is correct so in the general equation y=mx + b you worked out that m = 0.5 you worked out that b = -11 so the equation is y=0.5x -11 you can check that by looking at the point (-2,-12) is the equation true for that point?

  23. anonymous
    • one year ago
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    yes sir

  24. MrNood
    • one year ago
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    OK - so you did it!

  25. anonymous
    • one year ago
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    thank you soo much

  26. MrNood
    • one year ago
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    np

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