Question

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Answer 1

@millsemily/@bohotness /@misty1212 could one of you help out here?

Answer 2

y=mx+b for both lines

Answer 3

Okay...

Answer 4

That might be a bit hard to do.

Answer 5

no it isn't.

Answer 6

pick a line and find two points on that line

Answer 7

Okay, this isn't something I can do. Sorry.

Answer 8

don't be sorry

Answer 9

thank you for trying !! :) @Surana

Answer 10

I've been working on this for 5 hours

Answer 11

can you find the slope of one of the lines?

Answer 12

Y = mx + B is the x on one side, y on the other with the number on the same side as X, right? Because if it's that, I might know what to do.

Answer 13

sorry i don't quite understand

Answer 14

okay I picked two points on the left line. (-1,2) and (1,-2)

Answer 15

can you find the slope from that?

Answer 16

yes one moment

Answer 17

-2 is slope?

Answer 18

thats what i got

Answer 19

that's right

Answer 20

now find the y-intercept b by plugging in (x,y) for one of the points into the equation y=-2(x)+b

Answer 21

y-intercept from the graph ?? ^

Answer 22

yep you can also use the graph but try and do the math

Answer 23

there is an easy way to find y intercept
y -intercept where line cross y-axis's

Answer 24

for the point (-1,2) the equation is 2=-2(-1)+b. what is b?

Answer 25

for right line .

Answer 26

you still there piercetheveil47?

Answer 27

sorry im back i had to leave the computer for a minute

Answer 28

ok well b=0. this means that the equation for the line on the left is y=-2x

Answer 29

alright now pick two points on the right line

Answer 30

ok

Answer 31

(2, 3)

Answer 32

would that be one

Answer 33

yep

Answer 34

pick one more

Answer 35

okay (-2, 4)

Answer 36

nope wrong line

Answer 37

find a point on the other line

Answer 38

(0.5, -2)

Answer 39

i think that (1,-2)

Answer 40

but ya that is a point, well done

Answer 41

now take the two points (2,3) and (1,-2) and find the slope

Answer 42

okay

Answer 43

5

Answer 44

good

Answer 45

now find the y-intercept which is 'b' in the equation y=5x+b

Answer 46

how do you do that?

Answer 47

take one of the points and plug in the values for x and y in the equation

Answer 48

so y = 5(2) + 3?

Answer 49

almost. it should be 3=5(2) + b

Answer 50

we are trying to find b remember

Answer 51

ohhhhh

Answer 52

so what do i do now?

Answer 53

do you know how to solve for b? just a bit of algebra

Answer 54

no i don't recall :/

Answer 55

i'll rearrange the equation

Answer 56

okay :)

Answer 57

3-5(2)=b

Answer 58

can you solve it now?

Answer 59

yes one minute

Answer 60

-7?

Answer 61

that's right, good job

Answer 62

now we know m=5 and b=-7, what is the equation of the line?

Answer 63

remember: y=mx+b is the equation for a line

Answer 64

so y = 5x+7?

Answer 65

should that be +7 or -7?

Answer 66

ohhhhh im sorry

Answer 67

y = 5x + -7

Answer 68

great. So now you the equations for both lines. y=-2x and y=5x-7

Answer 69

now look at the choices and tell me what the answer is

Answer 70

you will have to rearrange the equations

Answer 71

ummmm is it A?

Answer 72

nope

Answer 73

take the equation y=-2x. put x and y on the same side.

Answer 74

what do you mean?

Answer 75

but now i feel like its either C or D

Answer 76

okay, add 2x to both sides of the equation y=-2x. what do you get?

Answer 77

2x?

Answer 78

nope. you get y+2x=0

Answer 79

do you get that?

Answer 80

oh yes

Answer 81

great. now do the same for y=5x-7

Answer 82

add 5x to both sides?

Answer 83

not quite. subtract 5x from both sides

Answer 84

oh okay. so would it be -12

Answer 85

nope. its y-5x=-7

Answer 86

the 5x on the right side cancels

Answer 87

now the last step is to multiply both sides by -1 which makes the equation 5x-y=7

Answer 88

so now you have the answers y+2x=0 and 5x-y=7

Answer 89

now you can pick from the options

Answer 90

so B??

Answer 91

ya thats right

Answer 92

thank you SO much!! @10115658

Answer 93

please ask if you have any questions cause i feel like i went through the last part pretty fast

Answer 94

its okay :) i get it now, thank you a lot, it took me 6 hours on this!

Answer 95

wow, thats dedication. Have a good night! :)

Answer 96

you too!! @10115658