What is the difference between |-3| and -3

Quadrilateral wxyz is on a coordinate plane. segment yz is on the line x+y=7 and segment xw is on the line x+y=3. which statement proves how segments yz and xw are related

If square root x = -7, then x= -49 true or false

What is the graph of the function fx x+2/x-3?