I need help with these MATH question.
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I need help with these MATH question.

[From: ] [author: ] [Date: 11-11-02] [Hit: ]
(-4,-1) (-6 ,0) (-8,4. (6,-2) (4,......
What are the equations for all these lines?
1. (3,1) (1,5) (-1,9)
2. (10,15) (7,10) (4,5)
3.(-4,-1) (-6 ,0) (-8,1)
4. (6,-2) (4,-8) (2,-14)
you need to find the y-intercept and the slope.
y-intercept=b
slope=m
y=mx+b
can you help??

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I think you'll find it useful if you actually did these yourself. =/

1. (3,1) (1,5) (-1,9)

m = y2 - y1/x2 - x1 [I'll use (3,1) and (1,5) to demo]

= 5 - 1/1 - 3

=4/-2

= - 2/1 [This is the slope]

y = mx + b [Take any of your points and plug them into x and y, I will use (3,1) to demo]

1 = - 2/1(3) + b

1 + (2)(3) = b [Get B by itself]

7 = b

b = 7

From that example alone, you should be able to do the next set of questions by yourself. It will be good for you, trust me. Come test time, you will be thankful that you actually did them. ;D

-
To find the equation, you only need two points on it!

1)

(3, 1), (1, 5)

m = (5 - 1)/(1 - 3)

m = - 2

- 2 = (y - 1)/(x - 3)

- 2*x + 6 = y - 1

y = - 2*x + 7

When x = 0, y = 7, point (0, 7) = y - intercept

slope = m = - 2

Do the rest!
1
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