Step-by-step explanation:
You could find a number that can be multiplied by 2 and a number for a that when you subtract from the number that you multiplied by 2 can give the result of 8.
Example:
a-2b=8: a=12-2•2=8
12-4=8
Answer:Point R is at (−20, 10), a distance of 30 units from point Q :)