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anonymous

  • one year ago

write an equation in the form y =mx+b for the line that passes through the point (-5,-1) and has a slope of -2

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  1. tkhunny
    • one year ago
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    Well, do it. You have "y = mx + b" and you are give the slope. Simply substitute that. y = -2x + b Now what? That point was given for a reason.

  2. anonymous
    • one year ago
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    do i subtract -2 from -1

  3. tkhunny
    • one year ago
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    Why would you do that? Use the given point. (x,y) = (-5,-1)

  4. anonymous
    • one year ago
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    i dont understand

  5. tkhunny
    • one year ago
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    What does (-5,-1) mean when it indicates a point on a line?

  6. pooja195
    • one year ago
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    Before any of the we need to do the point slope formula \[\huge~y-y_1=m(x-x_1)\] m=slope (x1,y1)

  7. anonymous
    • one year ago
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    y--2=m(x-x1)

  8. pooja195
    • one year ago
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    We also have the slope :) m=-2 try again

  9. tkhunny
    • one year ago
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    Yes, we can use the point-slope formula, but then you have to remember that. I prefer simply thinking. Please answer my question. What does (-5,-1) mean when it indicates a point on a line?

  10. anonymous
    • one year ago
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    y--1=m(x-x1

  11. pooja195
    • one year ago
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    Still wrong. Let me help you out :) -5 = x1 -1 = y1 -2=m

  12. pooja195
    • one year ago
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    Knowing that can you plug in the numbers?

  13. pooja195
    • one year ago
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    Stuck?

  14. tkhunny
    • one year ago
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    |dw:1434125042262:dw| "plug in numbers" doesn't mean anything. The idea of "substitution" is universal and should be burned into your brain.

  15. anonymous
    • one year ago
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    yes i am

  16. pooja195
    • one year ago
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    @tkhunny im sorry that my learning and teaching style is nothing like yours.

  17. pooja195
    • one year ago
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    y+1=-2(x+5) start by distributing \[\huge~-2(x+5) \] do you know how to do that part atleast?

  18. anonymous
    • one year ago
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    -10

  19. pooja195
    • one year ago
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    ok -2 * x = ?

  20. tkhunny
    • one year ago
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    @pooja195 No worries. We're all in this together. That's why I say, "I prefer this way." rather than "This is the way to do it or you are an idiot!" :-) Unique answers don't actually care how you find them. I am delighted there are different ways to go about it.

  21. pooja195
    • one year ago
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    :)

  22. pooja195
    • one year ago
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    \[\huge~y+1=-2x-10\] -10 + 1 =?

  23. anonymous
    • one year ago
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    -9 and i like poojas more better understand a little

  24. pooja195
    • one year ago
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    good so we have our answer :) y=-2x-9 :) and thanks

  25. pooja195
    • one year ago
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  26. anonymous
    • one year ago
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    thank u

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