How do you simplify the like terms in 9y-y-7y+3

9y-y-7y+3= y+3

Step-by-step explanation:

Any time there is no number in front of a variable, it's automatically 1, you just don't put the 1 there. So it would be

9y - 1y= 8y

So after you do that, you take the 7y and subtract it from 8y

8y - 7y= 1y

And remember you don't put the 1 so it simplifies to just y.

You simply add or subtract all the numbers with the same variable

I'm not the best at explaining so if you have any questions on it I can answer them in the comments :)

you should at least use a calculater

step-by-step explanation:

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".