A community for students.
Here's the question you clicked on:
 0 viewing
jagr2713
 one year ago
3x+6y=12
9x+y=21
jagr2713
 one year ago
3x+6y=12 9x+y=21

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you have to make the variable match in both equations. The easiest way to do that would be multiply the first equation by 3

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1What do you need to do?

jagr2713
 one year ago
Best ResponseYou've already chosen the best response.1don't we change the first equation into ymx+b

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1−9x+y+9x=21+9x(Add 9x to both sides) y=9x+21

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0it depends on the statement substitution , elimination/addition , or graphing ?

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1^thats what i meant to ask.

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1aight so continue with this −9x+y+9x=21+9x(Add 9x to both sides) y=9x+21

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1Now that you know what y equals plug it into equation 1 3x+6(9x+21)=12 solve for x

jagr2713
 one year ago
Best ResponseYou've already chosen the best response.1oh I did it the other way lol

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0\(\color{blue}{\text{Originally Posted by}}\) @jagr2713 don't we change the first equation into ymx+b \(\color{blue}{\text{End of Quote}}\) not necessarily, you don't have to write in slope intercept you can solve for x too.

pooja195
 one year ago
Best ResponseYou've already chosen the best response.1ok well what did u get for x?

jagr2713
 one year ago
Best ResponseYou've already chosen the best response.1um 2 so now we plug it into y=9(2)+21 y=3
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.