Question

Solve these two equations using substitution.
1) 3x - 9y = 3
6x - 3y = -24

Answer 1

Can you explain how you got that please?

Answer 2

multiply first equation by -2 and then add to second equation.

Answer 3

So then (-5, -2) is the answer?

Answer 4

yes it is.

Answer 5

I don't understand how to multiply the first equation by -2 though, can you like show the steps?

Answer 6

The method you used is not substitution.

Answer 7

It is the Elimination Method

Answer 8

It's okay if it's elimination.

Answer 9

well according to ur qn we need to use substitution method to get the answer

Answer 10

Sorry, it's just that you wrote to solve using substitution

Answer 11

@person97 is a genius. how did you understand, bro?? :)

Answer 12

ok then multiply first equation by two

then subtract both equations

Answer 13

Just finished that lesson in math.

Answer 14

Well, that's what I would like to have used but it doesn't matter. I just need help on this question.

Answer 15

did you try what i said above @FaithIsASiren_OhKellin? ?

Answer 16

@marsss we do not appreciate giving the final answer in the beginning like that .thank you

Answer 17

No, I said I didn't know how to multiply it by -2. That's why I asked if someone would show the steps.

Answer 18

you need to multiply by 2 not -2

Answer 19

@AravindG i think you shouldn't care, maybe :)

Answer 20

Actually you could multiply by both numbers, it's just that is you multiplied by -2, you would have to add, and if you multiplied by 2 you would have to subtract.

Answer 21

@marsss anyway you should for it can result in a ban

Answer 22

yep @person97 is right

Answer 23

I got 5x - 18y = 6. Pretty sure that's not right.

Answer 24

I mean 6x.

Answer 25

Which equation did you try?

Answer 26

i always tell everything what i think. if you want to ban me, please do it :)

Answer 27

The first one. Multiplied it by 2.

Answer 28

Anyway. it's right for the top equation if you multiplied by 2

Answer 29

Okay. & from there? add the second equation?

Answer 30

Then you would subtract equations.

Answer 31

ah. ok. subtract.

Answer 32

If you find it easier to add equations, you should multiply by -2

Answer 33

I'm so confused now. Someone subtract it.

Answer 34

@FaithIsASiren_OhKellin? multiplying first equation by -2 what did u get?

Answer 35

or add it, doesn't matter. I just need help with the last step.

Answer 36

I multiplied it by 2 and got 6x - 18y =6.

Answer 37

very good ! now subtract both equations

Answer 38

That's the part I don't know how to do.