Question

okay, this is a really dumb question, but i cant figure it out ,so help would be appreciated! (:


1. What is the slope of the line passing through the points (2, 7) and (–1, 3)? (1 point)

a. 2/7
b. 3/4
c.4/3
d.1/3

Answer 1

Use the slope formula


m = (y2-y1)/(x2-x1)


m = ( 3- 7)/(-1-2)


I'll let you finish

Answer 2

Tell me what you get

Answer 3

i know how to do that part, but i get for my answers -4/-3... none of which are the options

Answer 4

-4/-3 reduces to ????

Answer 5

you're dividing two negatives which do what

Answer 6

okay so 2 negs = a postive.. i know that, hold on let me grab a calculator

Answer 7

no need

Answer 8

-4/-3 = 4/3 and you're done

Answer 9

oh lol well thank you!!

Answer 10

the two negatives cancel each other out and go away

Answer 11

np

Answer 12

can you help me with a couple others?

Answer 13

sure

Answer 14

What is the correct equation of the line shown below?

Answer 15

first find the slope

Answer 16

a. y= 3/2x+ 3
b. y= -3/2x-3
c. y= 2/3x + 3
d. y= -2/3x -3


and okay

Answer 17

okay i got 0/-4... which would be?

Answer 18

that's not correct

Answer 19

crap hold on i got this lol

Answer 20

ok

Answer 21

0/4?

Answer 22

no

Answer 23

okay help lol

Answer 24

m = (y2-y1)/(x2-x1)


m = (3-(-3))/(0-(-4))


m = (3+3)/(0+4)


m = ??

Answer 25

you did 3-3 when it should be 3-(-3), which is the same as 3+3

Answer 26

6/4.. and okay i see what i did wring now, thank you

Answer 27

reduce that to get ???

Answer 28

1/5? i think

Answer 29

no

Answer 30

im so rusty on this ists been awhile :/ 1 1/2?

Answer 31

6 and 4 both have 2 in common

so divide both by 2 to get

6/2 = 3
4/2 = 2

so 6/4 reduces to 3/2

Answer 32

you're close, but 1 1/2 is in a different (unwanted) form

Answer 33

oh okay okay i get it now and yeah it is lol

Answer 34

so the slope is 3/2

Answer 35

the y-intercept is already given on the graph, and that's the point (0,3)

Answer 36

yep, and okay so its a? and question... what is that one equation for this is it y=mx+b? or something like that

Answer 37

it is choice A

Answer 38

m= slope y= y-intercept

Answer 39

and yes, it's y = mx+b

m = slope
b = y-intercept

Answer 40

known as slope-intercept form

Answer 41

you got it

Answer 42

yes awesome thank you, i am gonna try these last two on my own if i need help i will post it, thank you so much! i just need a brain refresher

Answer 43

you're very welcome, glad to be of help

Answer 44

okay ill post this one.. im a little confused

Answer 45

alright

Answer 46

go for it

Answer 47

The x-intercept of a line is –5 and the y-intercept of the line is –2. What is the equation of the line?

Answer 48

The x-intercept of a line is –5

means that we have the point (-5,0)

Answer 49

the y-intercept of the line is –2

means we have the point (0,-2)

Answer 50

so what we're really doing is finding the equation of the line that goes through (-5,0) and (0,-2)

Answer 51

the steps will be the same

1) find the slope using the two points and the slope formula to get m.
2) find the y-intercept, b, using y = mx+b

Answer 52

luckily the y-intercept is already given, so step 2 isn't so bad

Answer 53

okay so i got -2/5

Answer 54

for the first step

Answer 55

good, that's your slope

Answer 56

m = -2/5

Answer 57

the y-intercept is already given, and it is (0,-2)

Answer 58

-5 is y?

Answer 59

no

Answer 60

y=-2/5x+-2

Answer 61

or y = -2/5x - 2

Answer 62

so you got it

Answer 63

yayy! awesome! okay one more if you could help me through it?

Answer 64

sure

Answer 65

What is the slope-intercept form of the equation y – 7 = –5/2 (x + 4)? (1 point)

Answer 66

first distribute

Answer 67

y – 7 = –5/2 (x + 4)

y – 7 = –5/2x - (5/2)(4)

y – 7 = –5/2x - 20/2

y – 7 = –5/2x - 10

Then solve for y

Answer 68

which one first?

Answer 69

oh

Answer 70

you distribute the -5/2 through to each term in the parenthesis

Answer 71

okay, im kinda lost ... how do you solve for why?

Answer 72

you solve for y because slope intercept form is y = mx+b

Answer 73

and you can see that y is isolated in slope intercept form