x + y = 5
3x - y = 3
2007-02-11 02:21:15 · 6 answers · asked by melissa a 1 in Science & Mathematics ➔ Mathematics
x + y = 5
3x - y = 3
---------------
4x = 8
x = 2
2 + y = 5
y = 3
2007-02-11 02:23:28 · answer #1 · answered by leo 6 · 0⤊ 1⤋
x = 2 y = 3
2007-02-11 10:24:34 · answer #2 · answered by angelbabytrc07 2 · 0⤊ 0⤋
x + y = 5
+3x - y = 3
the Y's cancel out because -y +y =0
so you are left with
4x=8
x=2
then plug 2 into one of the equations
x + y = 5
becomes
2+y=5
y=3
you answers are x=2, y=3
2007-02-11 10:25:42 · answer #3 · answered by limallama 4 · 0⤊ 0⤋
x + y=5
x=5-y
-y=x/5
y=-x/5
3x-y=3
3x=3+y
x=3+y/3
x=1+y
y=x/1
y=x
2007-02-11 10:26:34 · answer #4 · answered by sin_talk 3 · 0⤊ 0⤋
x + y = 5
3x - y = 3 ------------------- Adding gives:-
4x = 8
x = 2
Now x + y = 5 so
2 + y = 5
y = 3
Solution is x = 2, y = 3
2007-02-11 10:59:07 · answer #5 · answered by Como 7 · 0⤊ 0⤋
x+y=5.............................1
3x-y=3..............................2
Multiply by 3 in EQUATION 1 and by 1 In EQUATION 2
[X+y]3=5 X 3
[3x-y]1=3 X1
Multipling we get
3x+3y=15
3x-y=1
Multiply by '-' in EQUATION 2
-[3x-y]=-[1]
-3x+y=-1
3x+3y=15
-3x+y=-1
4y=-16
y=-16/4
y=-4
substitute y=-4 in EQUATION1
x +(-4)=5
x -4=5
x=5+4
x=9
verification:-
x+y=5
substitute the values
9 -4=5
5=5
therefore (x,y)= (9,-4)
2007-02-11 10:51:13 · answer #6 · answered by srinu710 4 · 0⤊ 0⤋