Answer:
10x9=90
10x10=100
Step-by-step explanation:
I’m not extremely good at math but I think you need to make -x-y=1 into y=mx+b form and then solve your new equation!
What are you looking for?
Answer:
40
Step-by-step explanation:
you multyply 4 by 10 to get 40 or add 4 10 times
