Question

help!

Answer 1

hey conner...

Answer 2

ya?

Answer 3

anybody got an answer?

Answer 4

\[63 + 55 + z = 180\]
\[13x - 15 + z = 180\]

Answer 5

Solve either equation for either x or z, and plug back into the other.

Answer 6

so for the top one its just 63+55 basically?

Answer 7

Sorry, I typoed the first one. The first one should read 6x + 55 + z = 180

Answer 8

oh ok but still how would you do that cause theres no like terms to combine

Answer 9

Correct, but for instance, you can solve the 2nd equation for z very easily.
z = 195 - 13x.
Do you see that?

Answer 10

oh ya then its just 195 divided by 13?

Answer 11

Ehm, no. But back in the first equation there is a z. So you can put 195 - 13x in for z in the first equation.
Now you have only x's there.

Answer 12

wait so what do i plug in?

Answer 13

Since z = 195 - 13x. Where the z appears in the first equation, put 195 - 13x instead.
This is substitution method.

Answer 14

soooo z equals what im really confused here because your adding a whole othe quation to another one..

Answer 15

Ok, so back in the first equation:
Since z = 195 - 13x

\[6x + 55 + (195 - 13x) = 180\]
Do you see it?

Answer 16

Combine like terms, you only have x's now.

Answer 17

so 7x?

Answer 18

then what?

Answer 19

.....?

Answer 20

You can combine like terms to get 250 - 7x = 180.
Solve the equation.

Answer 21

so 7 divied by 180?

Answer 22

No, subtract the 250 from both sides...
-7x = -0.72
or
7x = 0.72

Answer 23

ok.. now multiply....?

Answer 24

theres no way the ange is .72

Answer 25

Sorry, no, I misread.
-7x = -70
or
7x = 70

Answer 26

so now divide?

Answer 27

yes.

Answer 28

so x=10?

Answer 29

Yes, now that you know x. You can plug 10 into wherever x appears in the SECOND equation.

Answer 30

so 115?

Answer 31

Negative.
The second equation is 13x - 15 + z
So if you substitute 10 in for x here you have:
13(10) - 15 + z = 180

Answer 32

ya 13 times 10 -15 is 115.

Answer 33

Yes, but z is not 115.
You have 115 + z = 180

Answer 34

sooo 65?

Answer 35

Thats it.
x = 10, z = 65

Answer 36

ok thank you much

Answer 37

Np.