Question

write the equation in point slope form of the line through points (4,-4) and (1,2) use the point (4,-4)

Answer 1

find the values of x and y. the diagram is not to scale. PLEASE HELP!!

Answer 2

For the first question, do you know how to find the slope of a line passing through (4,-4) and (1,2) ?

Answer 3

nope unfortunately im extremely stupid

Answer 4

\[\frac{ y_2 -y_1}{ x_2-x_1 }\]

Answer 5

Slope is: difference in y coordinates divided by the difference in x coordinates
Can you tell me what you get for slope?

Answer 6

2?

Answer 7

minus 2. When you take the y difference, you have to take the x difference the same way.
y difference is: 2 - (-4) = 2 + 4 = 6
x difference is: 1 - 4 = -3
slope = 6/-3 = -2

Answer 8

once you get the slope, to find the point slope form plug it into the equation:

(y - y1) / (x - x1) = m

Here they want you to choose (4, -4) as the point. So x1 = 4 and y1 = -4, m = -2
Just plug it in.

Answer 9

so 6/-3 = -2 is the point slope?

Answer 10

No -2 is the slope of the line.

Answer 11

and is 6/-3 a fraction? haha im confused. ok just real simple what is the answer to the question than sorry im being so difficult

Answer 12

Sorry. You have sufficient info to do the calculation.

Answer 13

alright so i plug -2 into the y=mx + b equation?

Answer 14

You plug it into: (y - y1) / (x - x1) = m
x1 = 4 and y1 = -4, m = -2

Answer 15

i have no idea what you just did there

Answer 16

That is the equation of a line in the point slope form. You know the slope and you know a point on the line. That is why it is called a point-slope form.

Answer 17

If it would make it easier you can also write the equation as: (y - y1) = m(x - x1)
x1 = 4 and y1 = -4, m = -2. Just plug in these three values in the equation and you are done.

Answer 18

ok so the answer is y-(-4) = -2(x-4)

Answer 19

Yes. But the -(-4) = +4
So it is y + 4 = -2(x - 4)
That is it!

Answer 20

really!!? yeah!! thnaks for all the help! think u could help me on the one with the diagram??

Answer 21

You need to solve for x and y?

Answer 22

yes

Answer 23

The interior angles of a triangle adds up to how many degrees?

Answer 24

180?

Answer 25

yes. Let me redraw with the vertex marked so it will be easy to discuss. hold on...

Answer 26

ok thanks!