Sunshine447
The equation of a circle is shown below.
(x + 5)2 + (y + 6)2 = 16
Martha uses the following steps to sketch a graph of the circle.
1. Draw a circle through the plot points (-1, -6), (-9, -6), (-5, -2), and (-5, -10).
2. Obtain the center (-5, -6) and radius 4.
3. Write the equation in the form (x - (-5))2 + (y – (-6)2) = 42.
4. Mark the point (-5, -6) on the coordinate axis.
5. Calculate and plot the points around the center using given radius 4.
What is the correct order of steps to sketch the circle?
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Sunshine447
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Choices:
2, 1, 3, 5, 4
1, 2, 3, 4, 5
3, 2, 4, 5, 1
4, 2, 5, 1, 3
Sunshine447
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@cwrw238
hba
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\[(x+a)^2+(y-b)^2=r^2\]
Sunshine447
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The radius is 4, right?
hba
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I agree.
Sunshine447
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Okay, but I still don't know the steps.... :(
hba
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(x-a)*
hba
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@Sunshine447 Where do you think you should start ?
Sunshine447
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either 3 or 5....?
Sunshine447
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@hba is it 3 or 5?
hba
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@Sunshine447 3 or 5 ?
Sunshine447
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3 i think...
Sunshine447
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wait....it has to be 3 cause5 isnt one of the choices.....
Sunshine447
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so its 2? I don't understand...
Sunshine447
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i think you'd have to write the equation right before trying to solve it....
Sunshine447
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@hba i think its C but im positive...
Sunshine447
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*im NOT positive....
Sunshine447
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I think the steps in C work
Sunshine447
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what do you mean?
Sunshine447
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well, you cant draw a circle without something to base it on, so A is wrong
Sunshine447
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*B is wrong
Sunshine447
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A is wrong cause you write the equation before drawing the circle
Sunshine447
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D is wrong for the same reason A is
Sunshine447
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okay.....
Sunshine447
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how do you find the center?
Sunshine447
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yes, you can but 1 shouuld be last.. its connecting the dots
Sunshine447
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true, but the equation should be already written... shouldn't it...?
Sunshine447
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@nincompoop so is it a or c?
Sunshine447
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that doesn't answer my question...... Is the answer A or C? No, I don't... Or are you implying BOTH.....
Sunshine447
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not even close....... geometry........
Sunshine447
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high school
Sunshine447
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no, just geo
Sunshine447
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so A or C... I still don't get it........
Sunshine447
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okay thanks!
Sunshine447
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@nincompoop i got another problem if you're willing to help....