I was trying to the variable 'y' isolated in the following expression, x + y = 2.

I did the following:
I subtracted 'x' from both sides, and I came up with y = -1x -2. Did I do it right? (I was trying to isolate the variable 'y'.)

Question

I was trying to the variable 'y' isolated in the following expression, x + y = 2.

I did the following:
I subtracted 'x' from both sides, and I came up with y = -1x -2. Did I do it right? (I was trying to isolate the variable 'y'.)

cderaalien · Answer

ah my favorite, @pooja195

pooja195 · Answer

xD ily2 <3
Yes that's correct

pooja195 · Answer

You can also write it as y=-x+2

cderaalien · Answer

I know, I just get confused sometimes when it's just 'x' and I forget the meaning of just the 'x' variable, even though in the back of my mind, I know it's just 1.

cderaalien · Answer

Thank you. <333

pooja195 · Answer

Yep that's what i do but good job well done ^-^ <3

pooja195 · Answer

yw ^_^

cderaalien · Answer

Can I ask something else?

pooja195 · Answer

go ahead :-)

cderaalien · Answer

How did you become so good at math, as in remembering the material? I have the ISEE test coming up and I'm super nervous, because it contains geometry and algebra 1, etc.

pooja195 · Answer

Practice, helping users on this site keeps my memory fresh I can help with anything up to Geometry since that's as far as i have gotten.

cderaalien · Answer

Also, why did you put the addition sign, when it's a minus sign (from subtracting x from both sides)

pooja195 · Answer

the 2 is positive

pooja195 · Answer

im not sure what ur referring to :-/

cderaalien · Answer

Okay, so I asked if y = -1x - 2 was the right answer. You said, "yes, it can also be written as "y = -x +2"

cderaalien · Answer

Why is there a "+2" instead of a "-2"?

pooja195 · Answer

$$\huge~\rm~ x + y = 2$$
We are isolating only y
$$\huge~\rm~ x-x + y = 2-x$$
By subtracting x from both sides we get the equation
$$\huge~\rm~\bf~y=2-x$$
We can leave it like this or we can write it like this
$$\huge~\rm~y=-x+2$$
To begin with the 2 was always positive

cderaalien · Answer

ah, so just because someone is subtracting, it wouldn't change the positive 2 to a negative 2?

pooja195 · Answer

Correct 2 is not a like term
now if it was 2x we would subtract an x but 2 is not a like term so we dont subtract from it

cderaalien · Answer

Thank you so much, sorry for not understand!! You're one of the best! Thank you again!!

cderaalien · Answer

not understanding *

pooja195 · Answer

thank you and yw ^_^ 
It's alright that you don't understand i'm happy you are asking questions! It shows that you are willing to learn and that's all I care about :-)