Question

Use the elimination method to solve the system of equations.( My number three key went out lol)

8u+three v =-17
three u +v=-5
The solution is ?

Answer 1

8u+3v=-17
3u+v=-5

What could you multiply one of the equations by that would make it where when you add them together, one of the variables would be eliminated?

Answer 2

multiplly the second equation by three

Answer 3

negative three

Answer 4

Yep. What do you get when you do that?

Answer 5

-6u-three v=-15

Answer 6

You shouldve got -9u-3v=15

Answer 7

8u+ three v=-17
-6u= three v=15

Answer 8

oh

Answer 9

yeah i see

Answer 10

Yep now add the equations
8u+3v=-17
-9u-3v=15

what do you get?

Answer 11

u=2

Answer 12

i subtract -9u from 8

Answer 13

and -17 from 15

Answer 14

Yep, so now that you know u=2

plug that in for u in one of the original equations and solve for v.

Answer 15

well it says substitute

Answer 16

so 2(2)+v=-5

Answer 17

3(2)+v=-5

Answer 18

ok so v=-1

Answer 19

Nope, v=-11

v=-5-6
v=-11

Answer 20

6+5

Answer 21

not 6-5

Answer 22

3(2)+v=-5
6+v=-5

subtract 6 from both sides
v=-11

Answer 23

so the solution is (2,-11)

Answer 24

Yep.
u=2
v=-11

Answer 25

ok thanks could you help me with another problem?

Answer 26

I could try

Answer 27

lol well thats all we could do

Answer 28

i am typing problem

Answer 29

solve by elimination method.(my number three key is out still tryna fix...)
5a+2b=-three9
-5a+b=48

the solution is?

Answer 30

lol, this one already has one that cancels out, so just go ahead and add them.

Answer 31

please show me what you are saying

Answer 32

ook

Answer 33

b+5a=-three9

Answer 34

b+5a=48
5a+2b=-three9

Answer 35

ok wait

Answer 36

ok you added the two end number 48 and three9

Answer 37

2b+b=three b

Answer 38

Did you type the equations wrong the first time?

Answer 39

no just whn i attempt i did

Answer 40

First you said
5a+2b=-three9
-5a+b=48

Then you said
b+5a=48
5a+2b=-three9

so which one are we doing?

Answer 41

th first one is correct

Answer 42

the first one

Answer 43

so i have to divide

Answer 44

29

Answer 45

b=29

Answer 46

what about solving for a

Answer 47

-5a+(29)=48

Answer 48

i think thats correct

Answer 49

ok i do not know what the hck im doing on this but how i seet thee problem up for wwhat it says that what it is but all that i tried to attempt to do i do know if im right or wrong

Answer 50

i dont know if im right or wrong

Answer 51

What are your answers?

Answer 52

im sorry if i confusd u

Answer 53

(29, ?)

Answer 54

i dont know how to do thee second step

Answer 55

Lets start fresh.
The equations are:
5a+2b=-39
-5a+b=48

Add them and you get

3b=9
b=3


Now that you know b, substitute it in and solve for a.

5a+2(3)=-39
5a=-45
a=-9

Answer 56

ok i will

Answer 57

So a=-9
b=3

Answer 58

so it is -9, 1/three

Answer 59

solution