You should find that your system doesn't have solutions. This is also confirmed by the fact that the determinant of the matrix of the coefficient of the variables x, y and z is equal to zero.
Second one is correct, The value of -a - c is positive
See, from the number line a = -6 and c = 2
Now, -a - c
= -(-6) -(2)
= +6 - 2 = 4
Which is true...
It has a 90 degree angle no more no less so yes. hope this helped
Answer:
140 degrees
Step-by-step explanation:
180-20+20 =140