Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Solve using two different methods. Explain which method you found to be more efficient.
a.) 3x9y=3
6x3y=24
 one year ago
 one year ago
Solve using two different methods. Explain which method you found to be more efficient. a.) 3x9y=3 6x3y=24
 one year ago
 one year ago

This Question is Closed

hbaBest ResponseYou've already chosen the best response.1
We can use two methods 1Substitution 2Elimination.
 one year ago

hbaBest ResponseYou've already chosen the best response.1
@dusty Do you know how to do these methods ?
 one year ago

dustyBest ResponseYou've already chosen the best response.0
no i don't really. Will you explain it to me?
 one year ago

hbaBest ResponseYou've already chosen the best response.1
Sure thing. lets take an example first.
 one year ago

hbaBest ResponseYou've already chosen the best response.1
Elimination method: When adding two equations, you basically add all parts of them. Say you had the equations: 4x + 5y = 14 4x  3y = 10 Adding them would give 2y = 4 4x + 5y = 14 + 4x  3y = 10 2y = 4 As you can see, the 4x and 4x cancelled out, therefore eliminating the variable x, leaving an equation with only one variable (y), able to be solved. 2y = 4 y = 2 Now that you have a value for y, you must find one for x. To do this, just substitute the value for y into either original equation, and solve it for x 4x + 5(2) = 14 4x + 10 = 14 4x = 4 x = 1 Your solution for these two equations is (1, 2).
 one year ago

hbaBest ResponseYou've already chosen the best response.1
x + y = 4, and 2x + y = 7. First you work in one equation, solving for one variable in terms of another. Let's solve for y in terms of x in the first equation (you can do whichever variable in whichever equation you want, but you should experiment, and start recognizing which is the simplest one). x + y = 4 x x y = 4  x Now this is where the substitution comes in. We substitute this value for y in the second equation. 2x + y = 7 2x + (4  x) = 7 2x + 4  x = 7 Combine like terms... x + 4 = 7 4 4 x = 3 Now you've solved for one variable, x, but you still need y. So...substitute your value for x into either equation and solve that linear equation to find y. x + y = 4 3 + y = 4 3 3 y = 1 The solution to this equation is x = 3, y = 1.
 one year ago

hbaBest ResponseYou've already chosen the best response.1
@dusty Source:Tripod If you want a step by step solution i will solve it for you.
 one year ago

dustyBest ResponseYou've already chosen the best response.0
Its okay I think i get it (: thanks alot!!
 one year ago
See more questions >>>
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.