To solve a set of linear equations in 3 variables, you need 3 equations. As far as I can tell, you have 2 equations here, so the best you can do is write expressions for 2 of the variables in terms of the third.
If you have
x +z +5z = -3y -3
3x -y = -4
Then you can rewrite as
x = -1.5 -0.6z
y = -0.5 -1.8z
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You can get this by any of the usual methods of solving linear equations. Just treat the system as two equations in x and y with the z terms on the right side of the equal sign:
x +3y = -3 -6z
3x -y = -4
Number 1: (-1+2i)+(6-9i)
Number 2: (3-3i)-(4+7i)
Number 3: (-5+2i)+(-2+8i)
D, 221 because 21 can be divided by 3, 77 can be divided by 7 and/or 11, 110 can be divided by 11, 221---none---, 65 can be divided by 5.
Hoped this helped :)
Answer:
A=5
Step-by-step explanation:
We can use 9's divisibility rule
Which is if we add all the numbers up, it should be divisible by 9.
So,
5+6+2=13
13 is closest to 18
So,
18-13
=5
Therefore, A=5.
Hope this helps!! :)
These questions just take some trial and error. Try a bunch of things. After about 2 minutes I came up with
(16 + 5) / (2 - 1 + 6)
You can check this by simplifying everything inside the brackets.
21 / 7
= 3
