I am confused because even C seems to be satisfying most of the numbers tested on this inequality . The answer is an obvious D, if we solve the algebraic inequality but on testing with numbers both options seem to be right
Am just trying to find a way to use the number plugging method accurately
Any body any idea ? Thanks ..
You need to test both numbers inside and outside the range of 1<x<9 to see if each inequality represents the condition of 1<x<9 and nothing more
. The inequality found in answer C satisfies the range 1<x<9 but also includes numbers outside of this range.
You likely only tested numbers inside this range, which resulted in your error.