Question

If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step?

2x − 4y = 6
3x − y = 12

Add the two equations together

Multiply the first equation by −4

Multiply the second equation by −4

Multiply the second equation by 4

Answer 1

Well, what are you having trouble with?

Answer 2

wat to do first

Answer 3

Well, you want to make it so if you add the two equations y disappears...

Answer 4

B then??

Answer 5

No. why would you try B?

Answer 6

nvm

Answer 7

i just relized wat i did wrong

Answer 8

so going off of wat u said i need to add them first or i need to get rid of the Y's first

Answer 9

You need to multiply one equation by a constant, and then add them. You want to make it so that the constant you mutiply by cancels out the y value when you add them.

Answer 10

ok

Answer 11

would it be D because mulitply 4 * 1 its going to be 4 and when you and 4 and -4 together it cancels each other out leaving the y-intercept out of the equation

Answer 12

careful - if you multiply by 4 when you add them you actually get -8y. You'll want to multiply the second equation by -4 actually.

Answer 13

oh ok

Answer 14

so C

Answer 15

yup.

Answer 16

ok thnk u for the help

Answer 17

You're welcome :)