Submit a question to our community and get an answer from real people.
Submit

Solve for x and y
139x+56y=641
56x+139y=724

plz....i need it soon

Report as

X = 2.98 and Y = 4.04. You will have to use substitution or elimination method to arrive at the answer. See steps below: 139x+56y=641------(i)
56x+139y=724-------(ii)
by subtracting eq. (i) from eq. (ii)
139x+56y=641
56x+139y=724
83x-83y=-88
83x-83y=-88
x-y= -88/83------(iii)
x-y= -1.06
now ,
adding eq. (i) and eq .(ii)
139x+56y=641
56x+139y=724
195x+195y=1370
X+y=1370/195
X+y =7.02-------(iv)
By subtracting eq. (iii) from eq. (iv)
X+y =7.02
x-y= -1.06
2y=8.08-----(v)
Y = 8.08/2
Y=4.04
Now substitute y = 4.04 in eq(iv)
X+y=7.02
X=7.02-4.04
X=2.98

Helpful (1) Fun Thanks for voting Comments (3)
Report as
WRONG!!!
139*2.98+56*4.04=640.46 !!!!
56*2.98+139*4.04=728.44 !!!!

x=3 y=4 - TRUE
Report as
error in your (iii)
x-y= -88/83 -wrong
x-y=-83/83 - true, because 641-724=-83 !!!!!
Go to school :)
Report as
error in your (iv)
X+y=1370/195 -wrong
X+y=1365/195 - true, because 641+724=1365 !!!!!
Go to school :)
Report as
Add a comment...

x=3 y=4

Helpful Fun Thanks for voting Comments (0)
Report as
Add a comment...
Do you have an answer?
Answer this question...
Did you mean?
Login or Join the Community to answer
Popular Searches