Question

Help me with this?

Answer 1

can u start by multiplying left and right hand side by 3? what will u get?

Answer 2

9

Answer 3

and I don't know who to do the other :/

Answer 4

Relax and let's work on it together okay?

\[a = \frac{ x + y + z }{ 3 }\]

multiplying left and right hand side by 3 - what will u get?

Answer 5

Okay thanks, 3a+ x+y+z?

Answer 6

Almost...it should be:

3a = x + y + z

u mixed up the "=" and "+" sign but its okay!

Answer 7

Oh /.\ sorry! What do I do next?

Answer 8

subtract 3a from the left and right, now what u get?

Answer 9

Um x+y+z-3a?

Answer 10

correct on the right hand side of the = sign....but how about the left hand side?

Answer 11

-3a=x+y+z-3a?

Answer 12

The right hand side was 3a before...now subtracting 3a from that, what will u get?

Answer 13

0!

Answer 14

Good job :)

so we have

0 = x + y + z - 3a

Now plz look at the choices in ur Q, what do u see?

Answer 15

not to butt in but your job is to solve for \(y\) not to set it equal to zero
it takes two steps only

Answer 16

so y is by itself on one side right? that means u need to move everything else on the other side...

Answer 17

@satellite73 yes, sorry I realize...too late...that I should have kept 3a on the left....

Answer 18

What do I do then?

Answer 19

take a step back...

3a = x + y + z

now because as @satellite73 said, we need to solve for y. So we need to move x and z over to the left hand side. ok?

Answer 20

Okay

Answer 21

We do that by subtracting x + y from the left and right hand side of the = sign

what will be on the left?

Answer 22

3a- x+y= z?

Answer 23

Yes and I made a mistake again :(

Answer 24

So it should look like this....

3a - (x+z) = x + y + z - (x+z)

so far so good?

Answer 25

I think I figured it out, is it this? y = 3a - x - z

Answer 26

Bingo :) u got it!

Answer 27

THANKS! YAY!

Answer 28

welcome!