how do you solve this??? you have to use elimination..
2007-09-17 14:07:16 · 7 answers · asked by lover 1 in Science & Mathematics ➔ Mathematics
Adding gives:-
2x = 24
x = 12
12 + y = 20
y = 8
x = 12 , y = 8
2007-09-20 06:55:02 · answer #1 · answered by Como 7 · 1⤊ 0⤋
x= 12 and y = 8
2007-09-17 21:15:51 · answer #2 · answered by GEE-GEE 5 · 0⤊ 0⤋
Not sure what 'elimination' is (been a while ;) )
Add the two equations:
x+y=20
x -y =4
----------
2x=24
x=12
plug in and solve for y
or you can also solve for x or y in one of the equations and plug it in:
x+y=20 becomes x=20-y. plug that into the second equation
(20-y) - y =4
20-2y=4
y=12
one of those should be elimination
2007-09-17 21:18:34 · answer #3 · answered by mf 2 · 0⤊ 0⤋
Try this-
Use the opposite to find x and y.
x+y=20
16+4=20 / 20-16=4.
I guess this works... Im not %100 sure though.
2007-09-17 21:20:17 · answer #4 · answered by Sun x Kissed 2 · 0⤊ 0⤋
you need to put both equations into y form. that would give you :
-x+20 = x-4
then solve down for x.
im pretty sure u should come out with an answer of x = 12.
2007-09-17 21:16:32 · answer #5 · answered by stratusfaction92 2 · 0⤊ 0⤋
the y in the first problem is postive and the 2nd is negative so those will cancel.
x+y=20
+ x-y=4
2x=24
x=12
then plug that into an origianl equation to find y.
2007-09-17 21:16:05 · answer #6 · answered by Alex 2 · 0⤊ 0⤋
X=12
Y=8
Please don't ask how i got this i know it's right but im not exactly sure how i got it.
2007-09-17 21:17:53 · answer #7 · answered by Me^^ 3 · 0⤊ 0⤋