Linear or non linear? plssss help

Answer:
A. no B. no C. yes D. yes E. no F, no G. no H. yes I. no
Step-by-step explanation:
The graph of a linear equation must be a straight line.
If you calculate the slope between coordinates and it is the same for all items in the chart, the function is linear. if it changes, it is a curve, not a straight line.