1. Solve.
2x+3y+4z=2
5x-2y+3z=0
x-5y-2z=-4
A.
(3, 4, 2)
B.
(-2 ,1, 2)
C.
(2, 2, -2)
D.
(1, 1, -2)
2 answers
The school subject is math, not college.
You could either substitute the 4 sets of values into one equation or start solving:
1. 2x+3y+4z=2
2. 5x-2y+3z=0
3. x-5y-2z=-4
Equ 1 x 2
4x+6y+8z=4
Equ 2 x 3
15x-6y+9z=0
add 19x+17z=4
from by inspection z must be opposite sign to x and x equals z so B) and C) are possible answers.
You could either continue solving the equations or substitute the two sets in say equation 1.
1. 2x+3y+4z=2
2. 5x-2y+3z=0
3. x-5y-2z=-4
Equ 1 x 2
4x+6y+8z=4
Equ 2 x 3
15x-6y+9z=0
add 19x+17z=4
from by inspection z must be opposite sign to x and x equals z so B) and C) are possible answers.
You could either continue solving the equations or substitute the two sets in say equation 1.
1 answer