If y represents a number then how can you write an expression for negative two times the sum of y and 7

In the given problem variable y is taken for unknown number.

We need to write an expression for "negative two times the sum of y and 7".

Let us break the given statement into smaller parts to understand it better.

" Negative two"

Negative is the minus sign and 2 is a number. So, negative two is -2.

"times"

Times represents multiplication operation × .

"the sum of y and 7".

The sum represents addition operation. Therefore, the sum of y and 7 can be expressed y+7.

Let us write expression for complete given statement.

Negative two times the sum of y and 7 = -2 × (y+7).

We can write, expression without times × symbol as.

-2(y+7).

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,