Question

(1) x-3y+7z= -16
(2) x-2y-z= -2
(3) x-8y+4z=3

Cara penyelesaiannya bagaimana

Answer 1

X-3y+7z=-16
x=3y-7z-16

x-2y-z=-2
x=2y+z-2

x-8y+4z=3
x=8y-4z+3

Answer 2

X-3y+7z = -16 .....(1)
x-2y- z= -2 ....(2) -
_______________
-5y+8z = -14 .....(4)

x-3y+7z= -16.....(1)
x-8y+4z= 3 .....(3) -
_____________

5y+3z = -19......(5)

(4) & (5)
-5y+8z = -14....(4)
5y+3z = -19.....(5) +
_______________
11z = -33
z = -3
5y+3z = -19
5y+3(-3) = -19
5y+(-9) = -19
5y = -10
y = -2

x-3y+7z = -16
x-3(-2)+7(-3) = -16
x+6-21 = -16
x+6 = 5
x = -1