Question

Choose the equation below that represents the line passing through the point (2, -5) with a slope of -3.

y = -3x - 13

y = -3x + 11

y = -3x + 13

y = -3x + 1

Answer 1

Well do you know the point slope formula?

Answer 2

y = mx + b

Answer 3

@halorazer /.\

Answer 4

No, no. That is slope intercept form. m is the slope and b is the intercept. I am talking about point slope. The equation that, given a point and a slope, you can figure out what the equation is.

Answer 5

im lost ;-;

Answer 6

That was a terrible explanation.
Point slope is \[y-y1=m(x-x1)\]
Slope intercept is
\[y=mx+b\]
In point slope form, you would put in the coordinates that you were given (2,-5) into their respective spots. (x1 would be 2 and y1 would be -5) then solve from there.

Answer 7

this doesnt make sense ;-; like nvm sorry for wasting your time ;-;

Answer 8

i dont understand how i would solve it?

Answer 9

Okay, well \[y--5=-3(x-2)\]
When you subtract a negative number, it switches the sign to a positive, so we get:
\[y+5=-3(x-2)\]
Can you take it from there?

Answer 10

would i subtact 2?

Answer 11

No, first you would distribute the -3 to the x and the -2.

Answer 12

so its y- -5 +-3- -6?

Answer 13

Well, you're getting close. Don't forget the equals sign in there. And the x on the -3.

Answer 14

omg i wrot that on the paper but didnt type it lol sorry cx

Answer 15

y- -5= -3x- -6

Answer 16

Yes. Don't forget about the subtracting a negative thing I told you.

Answer 17

subtract the 3?

Answer 18

No. y--5 means that it's actually y+5.

Answer 19

or the 6?

Answer 20

so i subtact the -6 from the 5 and 3?

Answer 21

or add?

Answer 22

I will work through it from the start and explain all my steps.

Answer 23

okay /.\

Answer 24

Given the point slope equation \[y-y1=m(x-x1)\]
and that we know what the points are (2,-5) we can put them in for y1 and x1
\[y--5=m(x-2)\]
When you subtract -5, you're actually adding 5.
\[y+5=m(x-2)\]
We also know the slope, which is -3. So we can put that in for m.
\[y+5=-3(x-2)\]
Next we have to distribute the -3 to the x and the -2.
\[y+5=-3x+6\]
We are trying to get it in slope intercept form which is \[y=mx+b\]
Which means that the y has to be completely alone. So in order to get it alone, we have to subtract 5 from both sides of the equation.
\[y=-3x+1\]
Which is your final option there.

Answer 25

imma take notes of this /.\
could you help me with 2 small questions? they are litterally small lol

Answer 26

Which of the following equations best represents the graph of f(n)?

f(y) = n

f(x) = n

x = f(n)

y = f(n)

Answer 27

Choose the equation of the horizontal line that passes through the point (-8, -7).

y = -8

y = -7

x = -8

x = -7

Answer 28

Is there anything else with the f(n) question?

Answer 29

no ;-;

Answer 30

As for the horizontal line, it means that it is staying at a single y coordinate. For example, a horizontal line going through -3,5 would be y=5. So the answer is A.

Answer 31

thank you!

Answer 32

ill ask some one else , thank you for all the help dear (:

Answer 33

sorry for bothering you

Answer 34

I think the answer to the f(n) thing is C. I could be wrong.

Answer 35

You are most certainly not bothering me. :)

Answer 36

thank you <3