What is the solution to the system of equations? x+3y−z=6 4x−2y+2z=−10 6x+z=−12 (−3, 5, 6) (2, 1, −3) (0, −2, −12) (−4, 0, 12)

A) -3,5,6

Step-by-step explanation: Took the test

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

i think the answer is d im not sure