23 what is the most important rule to remember when solving inequalities with negative numbers?

That you should remember to flip the sign (e.g. < becomes >) when you multiply or divide with them.

the answer is 5/3x+7/5y+7

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5