Matrices and row operations

transform this matrix to reduced row echelon form:

[2 -1 -4 | 7]
|0 -30 20 | -50|
[0 0 44 | -44]

result:
[1 0 0 | ? ]
|0 1 0 | ? |
[0 0 1 | ? ]

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

the correct answer is x/3+10≥32

hope this !

step-by-step explanation: