A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 2 years ago
I have to solve the system
7x  3y = 20
5x + 3y = 16
I solved it once;
7x  3y = 20
+ 5x + 3y = 16
= 12x = 36
= x = 3
7(3) = 3y = 20
= 21  3y = 20
21  21  3y = 21  21
= 3y = 1
= y = 1/3
so (3, 1/3)
But I cant figure out how to solve it for a nother way and get the same answer.
 2 years ago
I have to solve the system 7x  3y = 20 5x + 3y = 16 I solved it once; 7x  3y = 20 + 5x + 3y = 16 = 12x = 36 = x = 3 7(3) = 3y = 20 = 21  3y = 20 21  21  3y = 21  21 = 3y = 1 = y = 1/3 so (3, 1/3) But I cant figure out how to solve it for a nother way and get the same answer.

This Question is Closed

FZ6628
 2 years ago
Best ResponseYou've already chosen the best response.0Example: 2X+6Y=10 3X2Y=12 There is another method called substitution, in which you manipulate one of the equation to isolate a variable. For example 2X+6Y=10 can be manipulated into X=53Y Then you substitute the second part of the equation, 53Y in the second equation, 3X2Y=12, resulting in 3(53Y)2Y=12. Then you can use simple algebra to figure out X and Y

anonnnn
 2 years ago
Best ResponseYou've already chosen the best response.0I know about substitution, and I have attempted it several times in several different manners but I cannot come up with the same answer as the first.

Hero
 2 years ago
Best ResponseYou've already chosen the best response.0There's at least five different ways of solving these 1. Graphing 2. Substitution 3. Elimination 4. Matrices 5. Cramer's Method Pick one

Hero
 2 years ago
Best ResponseYou've already chosen the best response.0There's also slopeintercept method as well
Ask your own question
Ask a QuestionFind 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.