16--(3) $17
17--(3) $64
18--(2) $18
x=z/y divide by y on both sides
Imagine that the variable c represents something tangible, like an orange. So what this equation is asking is subtract 1 orange from 12 oranges. So you are left with 11 oranges.
Another way to think about this problem is if you rewrite the equation slightly to:
12c - c =
12c - 1c =
11c
Square root of 16 because it equals to 4 which is a rational number
