Question

What is the vaule of the expression x + y + - y
When x= -1 and y = 3

Answer 1

`x + y - y \\ - 1 + 3 - 3 \\ = - 1`

Answer 2

-1

Explanation:

This is a substitution question

The given equation is x+y+(-y)

And x is said to be-1,y=3

So let's solve

x+y+(-y)

Open the bracket first

x+y-y

So let's substitute

-1+3-3

-1+0

=-1

Therefore the final answer is-1