Algebra 2 help, please don’t answer if you don’t know.

If you were solving all the variables u could use a matrix but you're just trying to find Z with the last two equations so I used elimination. So I got 7x-5y=-3

Step-by-step explanation:

B)2x-2y-z=-9

C) x+y+3z=24

Step 1: multiple the whole equation of B by three so we can get rid of Z.

Step 2: Add the like terms. cause we multiplied by 3 to equation B we now have 6x-6y-3z=-27. Add that to equation C.

Step 3: first knock out the variable z then add the like terms so, 6x+x and -6y+y don't forget to also add the solutions so -27+24=-3

step 4 : final equation of getting rid of z

is 7x-5y=-3.

i got 10.28 but that rounds up to 10.3