2:8 Simplified (Please reply Quickly)

Which best explains why this triangle is or is not a right triangle?

Ialready asked this but i never got an answer. will give a high rating and perhaps brainliest. choose the linear inequality that describes the graph. the gray area represents the shaded region. y ≤ –4x – 2 y > –4x – 2 y ≥ –4x – 2 y < 4x – 2

Bring the fraction a/a-4 to a denominator of 16-a^2