Hi there!
A line segment, hence its name, is basically a part of a line. It has two endpoints and does not continue forever in any directions.
Hope this helps!
Problem 1
Answer: C) No solution
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Explanation:
We have z = -4 and 4z = -4 at the same time. Solving 4z = -4 leads to z = -1
So in effect we have z = -4 and z = -1 at the same time, but this is a contradiction. A variable can only hold one number at a time.
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Problem 2
Answer: C) Infinitely many solutions
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Explanation:
The two equations are equivalent. You can prove as such by isolating 2y in the first equation.
5x = 8-2y
5x+2y = 8
2y = 8-5x
2y = -5x+8
-5x+8 = 2y
This shows the first equation is equivalent to the second, and vice versa. They both graph the same line. Any point along the line is a solution. So that's why there are infinitely many of them.
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Problem 3
Answer: Choice A) 
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Explanation:
The range is the set of the possible y values. We're concerned with every y coordinate of each (x,y) solution. So we only focus on the shaded region.
The dashed line means we exclude the boundary. It's an electric fence we cannot touch. So y > -6 or -6 < y describes part of the range
The other part is
since y = 3 is the when the highest point occurs.
So writing
describes all possible y values of each (x,y) solution in the shaded region.
Answer:
The answer is 12.
12 is not a perfect square like the others.
Y=-3
If a line is ever completely horizontal, it's going to be y = a normal value, no X. x = a normal value is going to be a vertical line.