2006-11-23 18:50:07 · 20 answers · asked by hsoomr 1 in Science & Mathematics ➔ Mathematics
if x+y = 5 and 2x+y =6, then x = 1 ( by subtracting two equations)
if x =1, then y = 4
thus x -y = 1-4 = - 3
cool :)
2006-11-23 18:54:58 · answer #1 · answered by TJ 5 · 5⤊ 1⤋
2x+y = 6 =>> y = 6 - 2x
x+6-2x=5 =>> -x+6 = 5 =>> x = 6-5
X = 1 .
y = 6 - 2x =>> y = 6 - 2(1) =>> y = 6-2
Y = 4 .
X - Y = 1 - 4 = -3 .
2006-11-25 21:36:01 · answer #2 · answered by Anonymous · 0⤊ 0⤋
1+4=5, 2(1)+4=6, 1-4=-3
2006-11-23 19:00:42 · answer #3 · answered by Country 4 · 1⤊ 0⤋
x = 1. y = 4, 2x + y = 6 and x - y = -3
2006-11-23 18:59:09 · answer #4 · answered by webmaster@complete-webs.com 3 · 1⤊ 0⤋
well, i kinow the solution to this problem and it is
the equationis x + y = 5 and 2x + y = 6
using the first equation, make x the subject formular
therefore, x = 5 - y
subtitute the value of x into the second equation
2(5-y) + y = 6, then u open the bracket
10 - 2y + y = 6
10 - y = 6
collect the like terms
-y = 6 - 10
-y = - 4
there for the value of y = 4
to find the value of x
subtitute the value of y into any of the equation
using equation (i) { x + y = 5}
x + 4 = 5
collecting the like terms
x = 5-1
x =1
check
using eqn (i)
x + y =
1 + 4 = 5 correct
using eqn (ii)
2x + y =
2(1) + 4 =
open the bracket
2 + 4 = 6
thats it
2006-11-23 19:05:06 · answer #5 · answered by Rasheed S 1 · 0⤊ 1⤋
I like doing em this way:
y=5-x and y=6-2x
thus: 5-x=6-2x
then: -x=6-5-2x
then: 1x=1 or x = 1
substituting into equation one: 1+y=5
thus y=5-1 or y=4
x-y becomes: 1-4 or -3
2006-11-23 19:07:16 · answer #6 · answered by ontopofoldsmokie 6 · 0⤊ 0⤋
1-4= -3
2006-11-23 20:15:40 · answer #7 · answered by ♫tweet75♫ 3 · 0⤊ 0⤋
with x+y=5, subtract x from both side to make y=5-x.
so then insert that equation into 2x+y=6..which will look like this 2x+(5-x)=6, so thats x+5=6..so x is 1..which makes y=4..wow really simple math! no calculators needed.
2006-11-23 18:53:52 · answer #8 · answered by joruaishiteru 2 · 1⤊ 1⤋
x +y=6----(1) . 2x+y=6----(2). (2)-(1). x=1 y=4. x-y 1-4=-3
2006-11-23 22:10:42 · answer #9 · answered by frank k 1 · 0⤊ 0⤋
y= 4 x = 1...... 1 - 4 = -3
2006-11-23 19:01:22 · answer #10 · answered by muska275 1 · 1⤊ 0⤋