Question

Solve by using substitution.
6x + 6y = -6

5x + y = -13

What is the value of y?

Answer 1

no

Answer 2

if you subtract 5x so that you can get y=-5x-13 you can plug it in

Answer 3

\[6x + 6(-5x-13) = -6\]

Answer 4

still dont get it lol can someon go in debt more

Answer 5

True

Answer 6

The method of solving "by substitution" works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other. Then you back-solve for the first variable.

Answer 7

\[6x+6(−5x−13)=−6 \] use the distributive property to solve this :)

Answer 8

http://www.purplemath.com/modules/systlin4.htm <----if you still dont get it go here

Answer 9

thx so much @pooja195

Answer 10

you're welcome :) shall we finish solving the problem? ;)

Answer 11

yes

Answer 12

ok so solve what i gave you using the distributive property

Answer 13

how

Answer 14

\[6x+6(−5x−13)=−6\]
whats \[6\times-5?\]
whats\[6\times-13?\]

Answer 15

6 * -5=-30 and 6*-13=-78

Answer 16

good so we have \[6x-30x-78=-6\] combine like terms

Answer 17

-24x

Answer 18

yes so\[-24x-78=-6\] add -78 to -6 so
\[-6+78\]

Answer 19

72

Answer 20

now do 72/-24

Answer 21

-3

Answer 22

right so x=-3 do you know what to do next?

Answer 23

no lol

Answer 24

ok now we have to plug that in our equation WE made :) to get the Y value we had
\[y= −5(-3)−13\] solve

Answer 25

-15

Answer 26

-15-13=?

Answer 27

-28

Answer 28

wait we have this wrong

Answer 29

\[−5(-3)−13\]

Answer 30

i got -15 again

Answer 31

no a - + - = +

Answer 32

15

Answer 33

15-13

Answer 34

well done pooja

Answer 35

2

Answer 36

That's correct.

Answer 37

http://www.regentsprep.org/regents/math/algebra/AE3/AlgSysAdd.htm

Answer 38

http://www.regentsprep.org/regents/math/algebra/AE3/AlgSys.htm

Answer 39

thank you

Answer 40

You can make sure it's correct by plugging in the values and seeing if they make sense.

Answer 41

ok

Answer 42

Sorry the page froze on me ;-;
\(\huge\color{red}{WELCOME~TO~OPENSTUDY!!}\)

Answer 43

thx

Answer 44

@Cooper.dalen14
You may want to read these.
http://openstudy.com/code-of-conduct
http://openstudy.com/terms-and-conditions

Have a good time openstudying. :)