Answer: -108/+18 = -6
Step-by-step explanation: Multiply 18 by -6 for B then it simplifies out.
A.
If you solve it all out you get f(x)= -4x^2 -56x-202
1. 4/7 2. 1/2 3. 28/105 4. 20 or 20/1
5. 12 or 12/1 6. 9 or 9/1 7. 33/30 or 1 3/30
8. 16/60 or 4/15 9. 15/20 or 3/4
10. 10/24 or 5/12 11. 4 19/24
12. 68/45 or 1 23/45 13. 3/4 of time
14. 1/8 (not 100% sure)
There's only one system of equations here.
Let's eliminate x first,
x - y + z = -1
x = -1 + y - z
Substituting into x + y + 3z = -3 gives
(-1 + y - z) + y + 3z = -3
2y + 2z = -2
y + z = -1
Substituting for x into 2x-y+2z = 0 gives
2(-1 + y - z) - y + 2z = 0
-2 + 2y - 2z - y + 2z = 0
y = 2
Got lucky on that one.
z = -1 - y = -1 - 2 = -3
x = -1 + y - z = -1 + 2 - -3 = 4
Answer: x=4, y=2, z= -3
Check:
x-y+z = 4 - 2 + -3 = -1, good
x+y+3x = 4+2+3(-3) = -3, good
2x-y+2x = 2(4)-2+2(-3) = 0, good
