Question

find the missing coordinate......20x + 3y=27 (1/2,y)

Answer 1

x=1/2, put that value in, see what happens.

Answer 2

so 20 * 1/2 =10

Answer 3

right, so we get 10+3y=27

Answer 4

so 1/2 represents y also

Answer 5

No, you need to solve 10+3y=27 to get y.

Answer 6

ok you put a multiple with 3 to get your answer?

Answer 7

ehh, what? Do you know how to solve 10+3y=27?

Answer 8

no

Answer 9

Let's do it together.

Answer 10

ok

Answer 11

first we need to get the 10 on the other side, how do we do that?

Answer 12

10+3(10)

Answer 13

I'm afraid not, subtract 10 from both sides of the equation.

Answer 14

(10-10)+ (3-10)

Answer 15

10 - 3y is one side of the equation, 27 is the other.
So when we substract 10 from both sides we get 10-3y-10=27-10
Right?

Answer 16

ok

Answer 17

so what does 10-3y-10 equal?

Answer 18

?????

Answer 19

10-3y-10=10-10-3y=?

Answer 20

-3

Answer 21

are you sure?

Answer 22

10-3y-10= -3y and 10-10-3y=-3y...... so what am I doing wrong

Answer 23

right -3y

Answer 24

-3y=27-10

Answer 25

27-10=17 so the equation we get is -3y=17 right?

Answer 26

;~)

Answer 27

we're almost there, how do we get to y=... ?

Answer 28

wow i'm going to fail my test I thought we were done

Answer 29

You're done when you get to y=... now we have -3y=17

Answer 30

You need to divide both sides of the equation by -3 to get to y=...

Answer 31

what does the left side of the equation become if we divide by -3?

Answer 32

if i'm dividing -3 into -3????

Answer 33

you divide -3y by -3

Answer 34

-y

Answer 35

what's \[\frac{-1}{-1}\]?

Answer 36

i can't figuire it out

Answer 37

\[\frac{-1}{-1}=1\]
if you divide a negetive number by a negative number you get a positive number.

Answer 38

so what's \[\frac{-3y}{-3}\]

Answer 39

6y

Answer 40

\[\frac{2}{2}=1, \frac{-1}{-1}=1, \frac{-3}{-3}=1\]

Answer 41

\[\frac{-3y}{-3}=\frac{-3}{-3}y\]

Answer 42

So \[\frac{-3y}{-3}=y\] right?

Answer 43

??????

Answer 44

what is 2y/2?

Answer 45

are they both positive

Answer 46

yes, there are no minus signs.

Answer 47

y is the answer

Answer 48

right

Answer 49

so what's -3y/-3

Answer 50

y

Answer 51

that's right

Answer 52

that's one side of the equation

Answer 53

now the other 17/-3

Answer 54

i have just lost the whole purpose of the equation

Answer 55

We started out with 20x+3y=27, x was 1/2 and to find y we had to solve the equation 20*1/2 +3y=27

Answer 56

which makes me see that we made a mistake.

Answer 57

we had -3y, but it has to be 3y

Answer 58

can you write it in long form

Answer 59

You mean \[\frac{a}{b}\]
what do you want me to write?

Answer 60

this is very long I have to put this on the back burning and move to the next problem

Answer 61

Well y=17/3 for you information.

Answer 62

thank you for your help

Answer 63

You're welcome.