Question

I THINK IT'S D AM I RIGHT HELP !!
Select the best possible first step to solving the system by first eliminating the x variable.


4x + 9y = 21
3x - 8y = 1


Select one:


a. Multiply the first equation by 3 and multiply the second equation by 4.

b. Multiply the first equation by -3 and multiply the second equation by -4.

c. Multiply the first equation by 8 and multiply the second equation by 9.

***d. None of the above

Answer 1

a is the answer its really easy

Answer 2

BUT WHY ?

Answer 3

it is A

Answer 4

because if you do what a says the x variable is the same and will cancel each other out

Answer 5

yea it is d cause you need them to be opposite signs to cancel them out

Answer 6

one needs to be positive and one need to be negitive otherwise it can't cancel out

Answer 7

no
you do that when you put them into one equation you change the sign of one of the equations to negative thats the second step not first

Answer 8

not how i learned it.to cancel out they do need to be the same number but they have to be opostie signs.one will be positive 12 the other is negetive 12 and when added they cancel out

Answer 9

i have done algebra since I was 8 I know what I am talking about

Answer 10

think man if they are both positive 12 they will ad to 24.i should know cause ive done this stuff for 4 years now

Answer 11

actually 5 years cause im in 10th grade now.ive done it since 5th grade

Answer 12

because to cancel out you would do this just an example
2x+4=8
2x+6=12
2x+4-(2x+4)=8-12
I showed the whole thing \

Answer 13

and if the x variable was not the same you would multiply it by a number that would make them be the same

Answer 14

a

Answer 15

i would contend that a and b are equally best as options go

Answer 16

@amistre64 true

Answer 17

so it's A?

Answer 18

(4x + 9y = 21)*-3=-12x-27y=-63


(3x - 8y)*4= 1*4 =12x+32y=4
12x+(-12x)=0

-27y=-63
32y=4

4y=4
y=1

Answer 19

but i think they are looking for a, though

Answer 20

yes, a

Answer 21

my thought is that it is a poorly worded question and that they are expecting you to pick d

Answer 22

that is what i said @amistre64

Answer 23

what about marines work is it wrong? yeah thats what i thought and thats what marine said but everyone says it A

Answer 24

none of the options actually eliminates the x parts ... even tho a and b are viable first steps to take in the process

Answer 25

i would think it would be a because it is the first step

Answer 26

but it is asking you to eliminate

Answer 27

to eliminate you multiply them by a common variable but one ALWAYS has to be negitive to cancel them out which in this case is -3 and +4

Answer 28

id just multiply the top by -3/4 :)

Answer 29

When analyzing three linear functions, Michele noticed that they all intersected at the point (5, 3). What conclusion can Michele come to about the linear function with the smallest slope?


Select one:


a. It has the middle y-intercept.

b. It has the highest y-intercept.

c. It has the lowest y-intercept.

d. Michele cannot conclude anything.

Answer 30

what about this one its A right?

Answer 31

unless it shows the functions it is hard to tell

Answer 32

i think it would be d

Answer 33

i have to agree with athenasannabeth on this one

Answer 34

Connor went to New York for vacation. He spent 3 nights at a hotel and rented a car for 4 days. Jillian stayed at the same hotel, but spent 4 nights and rented a car for 5 days from the same company. If Connor paid $675 and Jillian paid $875, how much did one night at the hotel cost?


Select one:


a. $75

b. $100

c. $125

d. $150

Answer 35

i said it was 100 but how can i know if im right?

Answer 36

@hartnn

Answer 37

this is a tough one.im not sure

Answer 38

When planning his crops, Farmer Tim knows that his 7 acres can support peas and carrots. He wants to make $7,000 from his crops. He can make $2,000 per acre of peas (the variable p) and $1,000 per acre of carrots (the variable c). Which equation below would be a constraint in his system of equations?


Select one:


a. 2,000p + 1,000c = 7,000

b. 2,000p - 1,000c = 7,000

c. p + c = 7

d. c - p = 7

Answer 39

what about this one marines
???

Answer 40

the one with the hotel is 125

Answer 41

how did you get it?

Answer 42

it would be a for the one about crops

Answer 43

the reason is cause when you add the amount from peas and the one from carrots he will get 7,000 all together

Answer 44

this one i think its B am i wrong?

Answer 45

ITS D:)

Answer 46

NO NO NO, ITS C...OR B...IDK

Answer 47

BUT ITS DEFINETELY NOT A

Answer 48

for that one it is a because the second equatioon is in slope intercept form and +1 it the y intercept

Answer 49

you shouldn't do it the way I did but
I tried every answer so
125 multiply by 3= 375
675-375=300
so thats how much he paid to rent a car
then
300 divide by 4=75
then we figure out if it works for both of them
75 multiply by 5 = 375
875-375=500
500/4=125
but you should solve it by putting it in a equation oh and this is for the hotel one

Answer 50

is this D?

Answer 51

im guessing on this one.i think it is d.im not sure so i might need athena opinion

Answer 52

probably

Answer 53

this i think D?

Answer 54

it is a cause they intersect at positive 2,3

Answer 55

This is C??

Answer 56

ITS C

Answer 57

ITS C ITS C ITS C!!!!!:D

Answer 58

yea it is c

Answer 59

right?:D i have that class too!!!

Answer 60

its c

Answer 61

lol graciekeyr

Answer 62

i think that one is b

Answer 63

it is probably b

Answer 64

but is their more answers?

Answer 65

is this a test or something?

Answer 66

is that all you need help with?