You can solve this by solving the equation given for x, this will tell you the range of numbers that would make the inequality true.
7x + 1 >= 8 7x >= 8-1 7x >= 7 x >= 7/7 x >= 1
So, x would have to be greater than or equal to 1. Given the set of numbers in the problem; the numbers 1, 3, 6 would satisfy the inequality. The answer is (A).
Subtract to get your answer. So, 3 1/6- 1 4/6 Make improper fractions so easier to subtract 19/6-10/6=9/6= 1 3/6 So your answer is A. (It couldn’t be D because that’s more than you even started with.)