If NM=x-1 and AB=3x-7, then AB=?

To find the value of AB, we need to substitute NM's value into the equation for AB.

Given:
NM = x - 1
AB = 3x - 7

Substituting NM's value into the equation for AB:
AB = 3(x - 1) - 7

Now, we can simplify the equation by distributing the 3 to both terms inside the parentheses:
AB = 3x - 3 - 7

Combining like terms:
AB = 3x - 10

Therefore, AB is equal to 3x - 10.