2x-2a=0
2y-a=0
-2x-y+z+9=0
I know that x=2y and y=a/2 and x=a. Z is the variable that is causing me trouble.
2007-08-16 13:53:21 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
In the end, I need to find the value of all the variables (a,x,y,z) So, I only need to know the value of one variable to figure out the rest.
2007-08-16 14:03:53 · update #1
2x=2a Therefore x=a
2y=a Therefore y=a/2
-2x-y+z+9=0
or,z=2x+y-9
=2a+a/2 -9
=5a/2 -9
=(5a-18)/2 ans
2007-08-16 14:03:40 · answer #1 · answered by alpha 7 · 0⤊ 0⤋
Okay, Oki!
#1, label the equations 1,2,3 ect...
1)2x-2a=0
2)2y-a=0
3)-2x-y+z+9=0
Get rid of "x or a" sense both equations don't have the letter "z".
Notce: that all 3 equations represent a single leter, x,y,z.
2007-08-16 20:58:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Solve first two equations
x =+a
y = +a/2
then -2x-y+z+9 =0 = -2a-a/2+z+9 = -5/2a+z+9
z = 5/2a-9
That's all you can do
2007-08-16 21:02:28 · answer #3 · answered by nyphdinmd 7 · 0⤊ 0⤋
x=a
y=a/2
-2x+y+z+9=0
-2(a)+a/2+z+9=0
multiply by 2
-4a+a+2z+18=0
-3a+2z+18=0
2z=3a-18
2z=3(a-6)
z=3(a-6)/2
2007-08-16 21:03:35 · answer #4 · answered by cidyah 7 · 0⤊ 0⤋
I got x=a, y = .5a, z = -9 + 2.5a, and a is a free variable.
2007-08-16 21:03:29 · answer #5 · answered by FIESTA 3 · 0⤊ 0⤋
are you sure you solve for z a lot f math equations have a letter in the answer
2007-08-16 21:01:56 · answer #6 · answered by sasesel1 2 · 0⤊ 0⤋