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Mathematics 15 Online
OpenStudy (ofmiceparade):

I WILL MEDAL AND FAN! PLEASE!

OpenStudy (ofmiceparade):

What is the equation in point−slope form of the line passing through (−2, −5) and (2, 3)?

OpenStudy (anonymous):

Find the equation of the line which passes through the points (5, –3), (9, –3) in the point–slope form. A line passes through (3, 2) and its slope . Write an equation for the line in the form Ax + By = C. A line passes through (–3, –7) and its slope .

imqwerty (imqwerty):

when you are given any 2 points say \(\large (x_1,y_1)\) and \((x_2,y_2)\) then the equation of line passing through them is given liek this- \(\Large \frac{y-y_1}{y_2-y_1}=\frac{x-x_1}{x_2-x_1}\) 1st find the equation of line using this

OpenStudy (ofmiceparade):

so -5 - 3 and -2- 2?

OpenStudy (ofmiceparade):

@imqwerty ?

imqwerty (imqwerty):

i didn't get you?

OpenStudy (ofmiceparade):

I don't understand

OpenStudy (ofmiceparade):

@imqwerty Thanks for nothing

imqwerty (imqwerty):

okay we will go step by step be nice :)

imqwerty (imqwerty):

the 2 points given to us are-> \(\large (-2,-5)\) and \(\large (2,3)\) now we have to use this -> \(\Large \frac{y-y_1}{y_2-y_1}=\frac{x-x_1}{x_2-x_1}\) to get the equation of the line u gotta figure out \(x_1,x_2,y_1~and~y_2\) to get the equation of your line can you find these?:)

OpenStudy (ofmiceparade):

y-(-5) x-(-2) ----- = ------ is what i got 8 4

imqwerty (imqwerty):

yes correct :) now try to simplify it

OpenStudy (ofmiceparade):

...

OpenStudy (ofmiceparade):

How do you simplify

imqwerty (imqwerty):

okay well our main objective is to find the point slope form of the given line and the point slope form is given like this-> \(\Large y=mx+c\) where \(m\) is the slope and \(c\) is the y intercept of the line well now we have the equation of our line and to convert it into the point slope form we just need to isolate \(y\) :) so just isolate \(y\)

OpenStudy (ofmiceparade):

I have no idea. They're both in fraction form. How am i supposed to simplify that.

imqwerty (imqwerty):

kokay we have this-> \(\Large \frac{y-(-5)}{8}=\frac{x-(-2)}{4}\) 1st we open the brackets \(\Large \frac{y+5}{8}=\frac{x+2}{4}\) now 1st we remove that \(8\) from the denominator try multiplying both sides by 8 tell me what u get :)

OpenStudy (ofmiceparade):

y-(-5)= 8x-(-16) -------- 32

imqwerty (imqwerty):

no thats wrong we had this-\(\Large \frac{y+5}{8}=\frac{x+2}{4}\) after multiplying by 8 on both sides we get this-> \(\Large \frac{y+5}{8} \times 8=\frac{x+2}{4} \times 8\) \(\Large y+5=(x+2) \times 2\) so we will get this^ now try to isolate \(y\)

OpenStudy (ofmiceparade):

y= -5 (x+2)^2

imqwerty (imqwerty):

no thats bit wrong it will be this-> \(y=-5+(x+2) \times 2\) which can be simplified as follows- \(y=-5+2x+4\) \(y=2x-1\) and this is the required point slope form :)

OpenStudy (ofmiceparade):

Thats the answer?

OpenStudy (ofmiceparade):

(y + 2) = −2(x + 5) (y − 2) = 2(x − 3) (y − 3) = 2(x − 2) (y + 3) = −2(x + 2) These are my choices/

imqwerty (imqwerty):

oh damn i did it in point intercept form anyways just simplify the options and isolate y and the one which gives \(y=2x-1\) is the solution

OpenStudy (ofmiceparade):

So which of the choices is that?

OpenStudy (ofmiceparade):

@imqwerty

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