Question

2z+11=5z-7

Answer 1

@iGreen.

Answer 2

how would i solve this step by step?

Answer 3

okay so what we can do here is move x to oneside

Answer 4

sorry the z to oneside

Answer 5

First we subtract 11 to both sides.

\(2z + 11 = 5z - 7\)

\(2z + 11 - 11 = 5z - 7 - 11\)

See that?

Answer 6

why 11?

Answer 7

Because we have 11 there.

\(2z + \color{red}{11} = 5z - 7\)

We want to get rid of that, so we SUBTRACT it to both sides, because it's being adde

Answer 8

*added

Answer 9

ok

Answer 10

and how do you know what to subtract 11 from?

Answer 11

You subtract it to both sides of the equal sign.

\(2z + 11 = 5z - 7\)

\(2z + 11 \color{red}{- 11} = 5z - 7 \color{red}{- 11}\)

Answer 12

Get it?

Answer 13

how do u subtract without knowing what z is?

Answer 14

We want to get the z's on one side, and the other numbers on the other side..so we could've subtracted 2z from both sides too.

\(2z + 11 = 5z - 7\)

We can get all the whole numbers on the right side, and all the z's on the left.

Subtract 11 to both sides:

\(2z = 5z - 7 - 11\)

Now we subtract 5z to both sides:

\(2z - 5z = -7 - 11\)

Now we combine like terms.

Answer 15

Get it?

Answer 16

im still not sure

Answer 17

@iGreen.

Answer 18

What aren't you sure about?

Answer 19

i got lost on the subtract 5z part

Answer 20

@iGreen.

Answer 21

We never subtracted 5z..I think you're talking about 2z?

We want to get the z's on the same side, so I subtracted 2z to the other side with 5z.

Answer 22

kay and next? @iGreen.

Answer 23

@iGreen.

Answer 24

You have to subtract:

2z - 5z

and

-7 - 11

Answer 25

Oh yeah..we did subtract 5z to both sides..sorry.

Answer 26

is that negative -7 and -11? @iGreen.

Answer 27

That's -7z, and -7 - 11 isn't -11.

Answer 28

wait -7z came from? im sorry lol xD

Answer 29

2z - 5z = -7z

Answer 30

--7z is final answer?

Answer 31

@igreen.

Answer 32

No, we have:

-7z = -18

Then we divide -7 to both sides, -18 / -7 = ?

Answer 33

-2

Answer 34

what did you get 18 from by the way?

Answer 35

It's -18, and I got it from -7 - 11

Answer 36

And -18 / -7 isn't 2..

Answer 37

*-2

Answer 38

what did you get 18 from? @igreen my last question!

Answer 39

and 2 isnt a answer choice