Question

Solve 4/b-1/2b=-7/4

Answer 1

ok

Answer 2

Yes

Answer 3

\[if~ I~ say~ \frac{4}{b}=\frac{8}{2b}~does~it~make~sense~to~you?\]

Answer 4

ok lets try cross multiplying do u know how?

Answer 5

@greenninjahugs do u?

Answer 6

Yes

Answer 7

So, it'd be 8b = 8b?

Answer 8

@callie2240 and @Loser66

Answer 9

yes

Answer 10

I have to say no with the conclusion. However, one/time . let Callie helps.

Answer 11

Now 8b=-7/4 to solve for b u must divide 8 on both sides understand?

Answer 12

@Loser66 wat u mean no? if u think theres something wrong state it

Answer 13

Yes, so would it be easier for me to convert -7/4 into a decimal?

Answer 14

Wrong way friends.

Answer 15

and will lead to wrong answer!! SURE

Answer 16

then what way? I was taught this way so pls explain

Answer 17

first I need confirm the information. If I misunderstand, I am terribly sorry.
\[\huge \frac{4}{b}-\frac{1}{2b}=-\frac{7}{4}\]is it yours?

Answer 18

yes either cross multiply or get the same denominatore which isnt really possible with this one it seems

Answer 19

The negative sign is only on the 7, not the entire fraction.

Answer 20

the same.

Answer 21

where is the asker?

Answer 22

its @greenninjahugs

Answer 23

So, I converted -7/4 into a decimal then I divided it by 8 and came up with -0.21875.
My answer choices are 2, 7, 0, and -2., Would my answer be 0?

Answer 24

@greenninjahugs You should reply after my instruction, is it ok? I don't want to go too far before I figure out you don't get

Answer 25

Okay!

Answer 26

\[if~ I~ say~ \frac{4}{b}=\frac{8}{2b}~does~it~make~sense~to~you?\]

Answer 27

No, what did you do to get that?

Answer 28

just time both numerator and denominator by 2

Answer 29

because 2/2 =1

Answer 30

Okay, that makes sense

Answer 31

and now another thing, 8 cookies -1 cookie =? cookie?

Answer 32

don't think it doesn't relate, I 'll try to give you the simplest logic to get the answer.

Answer 33

7 cookies

Answer 34

\[good, ~if~ I~ say,~ \frac{1}{2b} is~cookies~then~I ~have~what?\]

Answer 35

\[\large \frac4b-\frac{1}{2b}=-\frac74\]\[\large \frac{8}{2b}-\frac{1}{2b}=-\frac74 \]\[\large \frac{7}{2b}=-\frac{7}{4} \]\[\large (2b)(-7)=(7)(4)\]\[\large 28 = -14b\]\[\large b = -\frac{28}{14} \]

Answer 36

7 * 1/2b?

Answer 37

\[8* ~cookies(\frac{1}{2b}-1*~cookie(\frac{1}{2b}= 7*~cookies\frac{1}{2b}\]

Answer 38

yah!! so the RHS you have \[\frac{7}{2b}\] right?

Answer 39

Right!

Answer 40

and the left hand side you have \[\frac{-7}{4}\]

Answer 41

make them equal, now \[\frac{7}{2b}=-\frac{7}{2*2}\]does it make sense?

Answer 42

Yes, then I should cross multiply?

Answer 43

Since b= -2,plug that back into your equation to check if it's right. \[\large \frac{4}{-2} -\frac{1}{2(-2)}=-\frac{7}{4} \]\[\large -2 + \frac{1}{4}=-\frac{7}{4}\]

Answer 44

mathematically, you are right, but to me, i just do something like