Question

To solve this system using the addition method, you would need to multiply the first equation by what number in order for the y's to add out?

3x - y = 3
-2x + 2y = 6

Answer 1

well you need the same coefficient for y if you want them to cancel. in the first one the coefficient of y is -1. and in the second it's 2.
so -1 x ? = 2

Answer 2

-1 x -1 = 2 ?

Answer 3

You would the first equation by 2, getting 6x -2y = 6.
when added to second equation the y's would "add out" or their sum is 0.

Answer 4

I left out the word multiply, which goes in the first sentence between " would * the"

Answer 5

so what would you multiply the eqaution by?

Answer 6

@hero. Don't just post the answer next time unless you absolutely need to...

Answer 7

I thought I was checking someone's answer. @Falkqwer misled me

Answer 8

Ohh...

Answer 9

Yes he did :)

Answer 10

lol I did

Answer 11

As I have previously posted, if you want to eliminate the y's, multiply the first equation by 2. this gives you:
6x -2y = 6 Now add the 2nd equation
-2x+2y =6
---------------
4x = 12
x=3

Answer 12

Now you can solve for y.

Answer 13

There can only be one right answer

Answer 14

@radar is right cause your supposed to Solve it using the addition method.

Answer 15

Substituting for x in the 2nd equation getting
-2(3) + 2y = 6
-6 +2y = 6
2y= 12
y=6
x=3, y=6 To be sure check them out

Answer 16

I found my mistake. Wha ta shame

Answer 17

Do we need to verify? Did you get (3,6) @Hero

Answer 18

@radar, what is it about "I found my MISTAKE" did you not understand?

Answer 19

It never hurts to verify substituting 3 for x, 6 for y
3x-y=3 or 3(3)-6=3
9-6=3
3=3 first one checks!
-2x+2y=6
-2(3)+2(6)=6
-6 +12 = 6
6=6 checks

Answer 20

No need to persist. Be happy that you provided the right solution and move on.

Answer 21

@Hero, just wanted to verify my answer, so I was simply asking if you got the same (after your error discovery.

Answer 22

When I said I found my mistake, that implies that I acknowledge your correct answer. Furthermore I gave you a medal. As I said, no need to persist beyond that.

Answer 23

Thanks @Hero