Answer: We will do (A) then you will be able to do most of them
Step-by-step explanation: For (A) first write it down
18x - 2y=0
Now we can explore many different combinations but I will give you something simple
18(1) - 2(9)=0 (note that two numbers beside each other means multiplication)
Now we can see this is now = 18 - 18 = 0