Write an equation of the line in standard form with the given slope through the given point.
slope = -3, (-4, -7)

A. y-3x = 12
B. y+3x = -12
C. y+3x = -19
D. y-3x= 19

Question

Write an equation of the line in standard form with the given slope through the given point.
slope = -3, (-4, -7)

A. y-3x = 12
B. y+3x = -12
C. y+3x = -19
D. y-3x= 19

anonymous · Answer

start with 
$$y+7=-3(x+4)$$ in the "point slope" form and then change it to standard form

lauluisa · Answer

Why 7? I don't get it..

mayankdevnani · Answer

http://www.mathsisfun.com/algebra/line-equation-2points.html

mayankdevnani · Answer

hope you understand ! @lauluisa

lauluisa · Answer

Thanks! I just read it... so it gives me
y+7 = -3x + 4
  y = -3x +11
@mayankdevnani

mayankdevnani · Answer

$$\large \bf y+7=-3(x+4)$$

mayankdevnani · Answer

not y+7=-3x+4

mayankdevnani · Answer

attachment

lauluisa · Answer

Yes I know that, but I have to solve... Right?

mayankdevnani · Answer

right

lauluisa · Answer

Ok, so that's what it gives me...  y = -3x +11

mayankdevnani · Answer

$$\large \bf y+7=-3(x+4)$$
$$\large \bf y+7=-3x-12$$
$$\large \bf y+3x=-19=\color{red}{Answer}$$

mayankdevnani · Answer

you made a mistake ! @lauluisa

lauluisa · Answer

Oh yes you right, I get it now lol Thanks!

mayankdevnani · Answer

don't apply this :-
`-3x+4` its `-3(x+4)`

lauluisa · Answer

I forgot to multiply 3 times 4...

lauluisa · Answer

-3*

mayankdevnani · Answer

now understood ??

anonymous · Answer

that damned distributive property gets you every time 
steps are always the same
first DISTRIBUTE

lauluisa · Answer

Yes thank you.. @mayankdevnani

mayankdevnani · Answer

good !!

mayankdevnani · Answer

and welcome :)