What is 7-y-y-1 is?

Answer 1

6-2y.

1) -y - y + 7 - 1

2) -2y + 7 - 1

3) 6 - 2y

Step 1:

-y-y = -2y. If you want, you can reorder the terms first (this helps some people organize, separating the variables), making it 7 - 1 - y - y, but this is not necessary to solving the problem.

Explanation:

Variables can be added or subtracted like normal numbers as long as they have a common base (y, in this case) and the same exponent (The exponent is not written, so it is one. If you have not yet learned exponents, ignore this rule.) Variables are added or subtracted like regular numbers, so saying -y - y = -2y is like saying -1 - 1 = -2

Step 2:

Now we have the expression -2y + 7 - 1. Next, we add or subtract. (The order or operations is PEMDAS: after you've dealt with the variables, the order is Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.) So, 7 - 1 = 6.

This leaves us with our answer: -2y + 6, or 6 - 2y (they mean the same thing).