Question

Solve, using linear combination.



3x + y = 4
2x + y = 5



A.


(–1, 7)


B.


(–3, 12)


C.
(0, 4)


D.


(–3, 13)

Answer 1

a. (-1,7)

Answer 2

thanks

Answer 3

yvw :)

Answer 4

i have a few more wold u help

Answer 5

Use the graph to state the solution for the system.

algebra unit 8 lesson 3 assessment question 2

x – y = –3 (line a)
x + y = 3 (line b)



A.
(3, 0)


B.


(–3, 0)


C.
(0, 3)


D.


(0, –3)

Answer 6

http://static.k12.com/calms_media/media/316000_316500/316447/1/78aa869289daceed943944bbb9fb154f0f76ad77/MS_ALG_S1_08_03_test_Q2_question.gif

Answer 7

(3,0)

Answer 8

hey @csscgirl do u know or wanna know how to change ur pic so its not a owl

Answer 9

or the os owl

Answer 10

sure :)

Answer 11

(0,3) is your answer

Answer 12

ok so its easy just look at the to right corner and it says settings click it the in the about middle area there is ur pic and it says change picture

Answer 13

thanks @texaschic101

Answer 14

How many solutions are there to the following system of equations?



2x + 5y = –11
10x + 25y = –55



A.
infinitely many


B.
0


C.
2


D.
1

Answer 15

oh thank you :)

Answer 16

yep np B)

Answer 17

a. infinitely many

Answer 18

r u sure cause i dont wanna fail i got a f in math so im tryin to redo

Answer 19

if you divide the whole thing by 5, you see that it is the same equation, so they are right on top of eachother.

Answer 20

this is my last chance to pass

Answer 21

infinitely many is correct

Answer 22

ooo ok

Answer 23

thanks

Answer 24

anytime :)

Answer 25

yep it is correct... use desmos.com/calculator to graph things, because it will help a lot, for this lesson or unit you are on, it will give you correct answers :)

Answer 26

yvw

Answer 27

How many solutions are there to the following system of equations?



3x + 7y = –10

15x + 35y = –45



A.


0


B.


1


C.


infinitely many


D.


2

Answer 28

@csscgirl U STILL THERE

Answer 29

15x + 35y = -45 --- divide by 5
3x + 7y = - 9

and your other equations is 3x + 7y = -10

if your lines have the same slope but different y intercepts, then they are parallel lines that do not intersect. Therefore, there is no solution.

Answer 30

so a thanks

Answer 31

sure thing :)

Answer 32

Solve the following system of equations by linear combination:



2d + e = 8
d – e = 4



A.


The solution is (5, –2).


B.
There is no solution.


C.
The solution is (4, 0).


D.
There are an infinite number of solutions.

Answer 33

i thought it was c

Answer 34

2d + e = 8
d - e = 4
-----------add
3d = 12 -- divide by 3
d = 4

sub in 4 for d in either of the equations to find e
d - e = 4
4 - e = 4
-e = 4 - 4
-e = 0
e = 0

solution is : d = 4 and e = 0

Answer 35

you got it right :) answer is C

Answer 36

i must have did it wrong, because idk.. sory

Answer 37

sweet thanks 1 more

Answer 38

Use the substitution method to solve the following system of linear equations:



x + y = 3

x = y – 7



A.
The solution is (–2, 5).


B.
There is no solution.


C.
The solution is (4, 1).


D.
There are an infinite number of solutions.

Answer 39

A

Answer 40

r u sure -.-

Answer 41

ok a i will see if it is

Answer 42

ima wait to see what texaschic says

Answer 43

yep... if you graph it, that is where they intersect.

Answer 44

ok :)

Answer 45

im not sayin ur wrong but

Answer 46

lets have it :)
oh..there it is...

x = y - 7
sub y - 7 in for x in the other equation
x + y = 3
y - 7 + y = 3 -- add 7 to both sides
y + y = 3 + 7
2y = 10
y = 5
now sub 5 in for y
x = y = 7
x = 5 - 7
x = -2

solution is (-2,5)

Answer 47

its all good :)

Answer 48

were cool B)

Answer 49

good a u were right thanks u all

Answer 50

glad to help :)

Answer 51

100%

Assessment Summary

Score:
6/6 points
Status:
Mastered

Answer 52

sweet thanks !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 53

sweet :)

Answer 54

before 50% 50% (3/6 points)
Submitted: 12/17/13 02:13 PM Not Mastered
after 100% 100% (6/6 points)
Submitted: 01/17/14 09:00 AM Mastered

Answer 55

Congrads :)