Can someone please help explain why the points were lost

Not enough detail (I think)

Step-by-step explanation:

For your vertical angle reason, it is fully incorrect because those aren't angles, they are lengths. For the others I just think you weren't specific enough. It seems fine to me but maybe your teacher is extra picky? It definitely would have happened to a lot of people. Hope my answer gave you a bit of relief!

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!