Final answer:
x1 can be written as + or x1 can be written as x1. x2 can be written as - or x2 can be written as x2.
Step-by-step explanation:
The values x1 and x2 can be written on WebAssign using different symbols or notations.
One way is to use the plus and minus signs, so x1 can be written as + and x2 can be written as -.
Another way is to use subscripts, so x1 can be written as x1 and x2 can be written as x2.