A community for students.
Here's the question you clicked on:
 0 viewing
JessNicole
 3 years ago
x+y=4
2xy=5
What is the solution to this system?
JessNicole
 3 years ago
x+y=4 2xy=5 What is the solution to this system?

This Question is Closed

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1use elimination method

Mr.Me
 3 years ago
Best ResponseYou've already chosen the best response.0add down using elimination method

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1add solve for x then solve for y I think it will be easier

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1multiply both side of x+y=4 by 5 and multiply both side of 2xy=5 by 4

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1I think adding two equation will give you in x terms only... no ned to go in a roundabout way

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you SO MUCH! all of you @gerryliyana @Rosh007 @Mr.Me I appreciate 100% :p

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1welcome..so u got it... O glad..

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0Is the answer suppose to be a decimal tho??

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0because i got 0.3333333333.. etc.

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1what did u get it??

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0by using the elimination method ... Oh okay @gerryliyana then plug that in to x in x+y=4 ?

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1yes... first you nd to eliminate one variable... sinc there are two equations and two unknowns.. it would is possible... but you won't get 0.3333.. in this case

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1NO!!! you have two use the equations which are available to you

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0What would it be @Rosh007 because thats what i got, am i doing it wrong then??

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1ur right @JessNicole

jazy
 3 years ago
Best ResponseYou've already chosen the best response.0Try using substitution and see if you got the same as me. (:

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1@jazy you made a mistake here Solve for x in the first equation. x + y = 4 Subtract y. x = 4  y Substitute the value of x into the second equation. Solve for y. 2(4  y) = 5  mistake

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1be careful @jazy 2(4  y) = 5 ???? the right is 2(4  y)  y= 5

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@jazy THANK YOU!!! it makes sence but @Rosh007 how is it a mistake?

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1be careful @jazy the mistake at 2(4  y) = 5 ???? the right is 2(4  y)  y= 5

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1@JessNicole please look gerryliyana's reply

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0Ohh okayy, i see now soo, it'd be Distribute 8y=5?? @Rosh007 and @jazy ??

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1jazzy missed one y there

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@gerryliyana Thank youuuu!!:) for catching that mistake, i fixed it on my paper!

jazy
 3 years ago
Best ResponseYou've already chosen the best response.0I prefer substitution. x + y = 4 2x  y = 5 Solve for x in the first equation. x + y = 4 Subtract y. x = 4  y Substitute the value of x into the second equation. Solve for y. 2(4  y)  y = 5 Distribute. 8  2y  y= 5 Subtract 8. 2y  y = 3 3y = 3 Divide both sides by 3. y = 1 Now plug in the value of y(1) into any equation to solve for x. x + y = 4 x + 1 = 4 Subtract 1 x = 3  So x = 3 and y = 1

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@gerryliyana What would it be then?

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.12(4  y)  y= 5 8  3y = 5

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.12(4  y)  y= 5 8  3y = 5

jazy
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you catching that mistake! (:

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1yes you got it jazzy.. but a very simpl method is there

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1@JessNicole 2(4  y)  y= 5 8  3y = 5

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@jazy @Rosh007 @gerryliyana THANK YOUUUUUUUUU!! SO MUCH EVERYONE!!:D .. I'd give all of you guys each a medal if i could!!

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1sice answer is already wrote here( which I don't like to do write directly) it is for you to know that there is a simple method than this

gerryliyana
 3 years ago
Best ResponseYou've already chosen the best response.1@JessNicole ur welcome..., happy to help u :)

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@Rosh007 There's an easier way ? cause you can teach it to me ..this stuff is hard for me, i'm always confused.

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1actually it is derivd from the method mentioned here.. It is actually a special case of this method.. it is applicabl here since in one equation +y and in other equation y is there actually the problem is simple x+y=4 2xy=5 dw:1353003234368:dw so when we add both equation (LHS with LHS and RHS with RHS) you get 3x =9 which can be simplified quickly and reach the answer fast

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1actually the problem is simple x+y=4 2xy=5 add x+y+2xy = 5+4 3x+0 = 9 3x =9 if you substitute the value of x in equn 1 you get th value of y....

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0@Rosh007, yess! i understood perfectly. It is much simpler!..Thank you very much. I really appreciate it.!:)

Rosh007
 3 years ago
Best ResponseYou've already chosen the best response.1Welcome...But remember it is a special case ;) all the best

JessNicole
 3 years ago
Best ResponseYou've already chosen the best response.0Ha ha okay, thank youagain !:p
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.