Since we don't know what the number is, we can use a variable to represent it. Let's use n.

"nine more than twice the number" means "the number plus 9" which is n+9

"the same as" means "equals"

"one less than" means minus 1 and "twice the number" is two times the number, so "one less than twice the number" means "two times the number, minus 1" which is 2n-1

Putting this all together:

n + 9 = 2n - 1

Now we can solve the equation. Start by adding 1 to both sides:

n + 9 + 1 = 2n - 1 + 1

n + 10 = 2n

Now subtract n from both sides:

n + 10 - n = 2n - n

10 = n

The number is 10.

Check your work:

Nine more than 10 is 19

Twice 10 is 20, and one less than that is 19

They are the same

Cheyenne D.

Thanks but how would I wright that? 9+x-2x-1? or 2x-1=9+x? plz this is really confusing me?!12/02/21