Algebra Help? Easy Question- I Forgot Something Though?

Question

I have this math question that is the following:

y= -x - (-5)

and i changed it into 'add the opposite...

y= -x + 5

and we're doing input/output. also known as function and domain...

well, one of the input is -2.

so if i were to substitute the -x to -2...

would the negative from the -x cancel out the negative from the -2?

i really need to know!

i'm thinking that it just stays negative two, but i'm not one-hundred percent on that. ten easy points!

Answer 1

yes

in the expression -x

if x=-2

then -x=2

Answer 2

So the equation would turn to:

y= -(-2) + 5

right?

So you do the same thing.  Two negatives multiplied equal a postivie.

y = 2 + 5

Answer 3

ummm....x+pie= the radius of an ocillis triangle