The complex number are formed by a real part and an imaginary part.
The imaginary part is indicated with the letter i.
2i is only imaginary, so it is not complex
i - 1 is complex but is out of the triangle.
1 - i indeed is complex and is inside the triangle
2 - 3i is complex but is out of the triangle.
So, the answer is 1 - i
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You substitute the y from the second eqaution to the y in the first equation
Y=210-7X you have $210 and want to know how many books she can buy with that money.
This is the symmetric property of equality, and in a more general form it can be written as: if a=b then b=a.
<span>This is not to be confused with communicative property, which says that the order doesn't matter in some operations, such as addition, and can be written as a+b=b+a</span>
