Answer: D. x + 2 = y
Step-by-step explanation:
The only answer option that represents a linear function is option D. The other three, A, B and C, all represent quadradic functions. You can tell they're quadradic functions because the highest degree is a 2, or a square. This gives a parabola and is not linear.
With this information in mind, the answer is;
"D.x+2=y"
