- #1
lamerali
- 62
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Solve the following system and interpret the result geometrically
3x + 4y + 5z - 18 = 0
2x - y + 8z - 13 = 0
-x + 17y + 25z + 11 = 0
My answer:
3x + 4y + 5z – 18 = 0 (1)
2x – y + 8z – 13 = 0 (2)
-x + 17y + 25z + 11 = 0 (3)
Multiply (1) by 2 and (2) by 3
6x + 8y + 10z – 36 = 0
6x – 3y + 24z – 39 = 0
Subtract the two equations
11y – 14z + 3 = 0 (4)
Multiply equation (3) by -3
3x – 51y – 75z – 33 = 0
Subtract the equation from (1)
55y + 80z + 15 = 0
Simplify
11y + 16z + 3 = 0 (5)
We now have the new system
11y – 14z + 3 = 0 (4)
11y + 16z + 3 = 0 (5)
Subtract (4) from (5)
30z = 0
this is as far as i got...i'm not sure if it is correct and if it is correct i don't know what it geometrically represents.
any guidance is appreciated
Thanks in advance
3x + 4y + 5z - 18 = 0
2x - y + 8z - 13 = 0
-x + 17y + 25z + 11 = 0
My answer:
3x + 4y + 5z – 18 = 0 (1)
2x – y + 8z – 13 = 0 (2)
-x + 17y + 25z + 11 = 0 (3)
Multiply (1) by 2 and (2) by 3
6x + 8y + 10z – 36 = 0
6x – 3y + 24z – 39 = 0
Subtract the two equations
11y – 14z + 3 = 0 (4)
Multiply equation (3) by -3
3x – 51y – 75z – 33 = 0
Subtract the equation from (1)
55y + 80z + 15 = 0
Simplify
11y + 16z + 3 = 0 (5)
We now have the new system
11y – 14z + 3 = 0 (4)
11y + 16z + 3 = 0 (5)
Subtract (4) from (5)
30z = 0
this is as far as i got...i'm not sure if it is correct and if it is correct i don't know what it geometrically represents.
any guidance is appreciated
Thanks in advance