Question

1. Write an equation in slope-intercept form of the line with the given slope and point: slope = 3 and (1, -2).
A. y = 3x - 5
B. y = 3x - 2
C. y = 3x + 1
D. y = 3x + 3

2. Write the equation of the line that passes through (-4, 12) and (7, 23).
A. y = x + 16
B. y = 3x + 18
C. y = 1/6 x + 16
D. y = 1/3 x + 18

3. http://roads.advancedacademics.com/contentserver/content/roadssection/277812/questions/4-hw7/slope_intercept_2.gif

Write an equation in slope-intercept form for the line shown.
A. y = 2/3 x + 2
B. y = 3/2 x - 4
C. y = 3x - 4
D. y = 2x - 1

Answer 1

you have to use y-y0=m(x-x0) and m=y1-y0/x1-x0 where (x0,y0) is your first point and (x1,y1) is your second point on the coordinate system. solve this and you will get answers i can give you answers but it will not do you any good. use these equations for your work.

Answer 2

ok
Me Engr has give the formula already, but I guess you can't read it the way it is, so her it is more clearly.\[y-y_0=m(x-x_0)\]where m is the slope (given to you in the first problem) and the point it is passing through is \[(x_0,y_0)\]since you are given m you can plug those three numbers m, x0, and y0 into the formula above.
what is your point?
what is m for your line?

Answer 3

k will it be A?

Answer 4

it sure will!
you getting good.

Answer 5

k so will u use the same formula for the next ones?

Answer 6

brb

Answer 7

I dnt know number 2.

Answer 8

ok I'm back...

Answer 9

ok i think 3 is B. Am i correct?

Answer 10

for number 2 we well use the same formula we used on the other problem to get the slope\[m=\frac{y_2-y_1}{x_2-x_1}\]where\[(x_1,y_1),(x_2,y_2)\] are the two points in the problem...

Answer 11

I don't know I haven't checked

Answer 12

No it is not B
If you can find the slope you will basically have your answer...

Answer 13

use the two points you know the line passes through in the formula above to find the slope

Answer 14

Well idk the answer. Every time i figure out the problem i gives me 3/2x.... And i'm getting fustrated.

Answer 15

ok tell me what you put for \[y_2-y_1\]

Answer 16

23-12

Answer 17

great and what about\[x_2-x_1\]?

Answer 18

7+4

Answer 19

great!
and what do you get when you put them together to find m with the formula\[m=\frac{y_2-y_1}{x_2-x_1}\]

Answer 20

first of what is
23-12=?
and
7+4=?

Answer 21

11
11

Answer 22

so what do you get when you divide them?

Answer 23

\[m=\frac{y_2-y_1}{x_2-x_1}=\frac{11}{11}=?\]

Answer 24

1 :) u make me sound dumbe lol j/k

Answer 25

sorry, just have to go slowly with math...
so I Now will tell you that one formula for a line is\[y=mx+b\]we know what m is so we know what number goes next to the x.
Using what we know m is, what is the answer?

Answer 26

only one answer has the right value for m
the right number next to the x.

Answer 27

so what is the answer to number 2 ? @kija_lee