Gokuporter
  • Gokuporter
Use Point-Slope form to write the equation of the line in standard form. Picture will be below.
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Gokuporter
  • Gokuporter
|dw:1449958607896:dw|
Directrix
  • Directrix
Definition of POINT-SLOPE FORM. : the equation of a straight line in the form y − y1 = m(x − x1) where m is the slope of the line and (x1, y1) are the coordinates of a given point on the line.
Gokuporter
  • Gokuporter
So is it\[\frac{ -1 }{ 13 }\]

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Directrix
  • Directrix
I did not get that. Let me check my work. |dw:1449959808268:dw|
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Gokuporter
  • Gokuporter
Oh I messed up
Gokuporter
  • Gokuporter
So do we use y=mx+b formula?
Directrix
  • Directrix
Let's try something a little different. Go here and enter the two points. http://www.mathportal.org/calculators/analytic-geometry/two-point-form-calculator.php Click on General Form after you enter the two points. Attached is what you will see. Enter your points.
Directrix
  • Directrix
Crank that out and post what you get for the equation of the line. Note that you can click to get an explanation.
Gokuporter
  • Gokuporter
http://prntscr.com/9dglja ?
Directrix
  • Directrix
Yes. On the page, click "Calculate."
Gokuporter
  • Gokuporter
http://prntscr.com/9dgmd0 I don't get this.
Directrix
  • Directrix
I don't either. Click on calculate.
Directrix
  • Directrix
I think you clicked on "Generate Example" to get that.
Directrix
  • Directrix
This program is a handy tool but if it does not work for you let's return to cranking out the equation by hand.
Directrix
  • Directrix
@Gokuporter
Gokuporter
  • Gokuporter
Lets do the equation by hand
Directrix
  • Directrix
The slope is -3/13 Point slope form looks like this: Definition of POINT-SLOPE FORM. : the equation of a straight line in the form y − y1 = m(x − x1) where m is the slope of the line and (x1, y1) are the coordinates of a given point on the line.
Directrix
  • Directrix
Choose either point. I am choosing (9,-2) y − y1 = m(x − x1) y - (-2) = (-3/13)*(x - 9) Simply that. @Gokuporter
Gokuporter
  • Gokuporter
y + 2= (-3/13)*(x - 9)
Directrix
  • Directrix
Use the distributive property to multiply this: (-3/13)*(x - 9).
Gokuporter
  • Gokuporter
-3/13x * -3/13- 9
Gokuporter
  • Gokuporter
Hello?
Directrix
  • Directrix
y + 2= (-3/13)*(x - 9) y + 2 = (-3/13)*(x) + (-3/13) * (-9) y + 2 = (-3/13)*(x) + 27/13
Directrix
  • Directrix
Multiply through by 13 to clear fractions: y + 2 = (-3/13)*(x) + 27/13 13*y + 13*2 = 13* (-3/13)*(x) + 13 * ( 27/13) 13*y + 26 = -3x + 27
Gokuporter
  • Gokuporter
What's next?
Directrix
  • Directrix
13*y + 26 = -3x + 27 Subtract 26 from both sides of the equation.
Gokuporter
  • Gokuporter
3y=-3x
Gokuporter
  • Gokuporter
@Directrix
Directrix
  • Directrix
>> 3y=-3x Not correct
Gokuporter
  • Gokuporter
13y=-3x
Directrix
  • Directrix
y + 2 = (-3/13)*(x) + 27/13 13*y + 13*2 = 13* (-3/13)*(x) + 13 * ( 27/13) 13*y + 26 = -3x + 27 13*y + 3x = 27 - 26 3*x + 13*y = 1 This is what I think is meant by standard form. 3*x + 13*y - 1 = 0 This is what I think is meant by general form. Look at your answer options. To my thinking, there is lack of agreement over which form is which.
Directrix
  • Directrix
Look at what the online program cranked out
Gokuporter
  • Gokuporter
Is that it?
Directrix
  • Directrix
It looks like the end of the line to me. Use Point-Slope form to write the equation of the line in standard form. 3*x + 13*y - 1 = 0 This is what I think is meant by general form.

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