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venn diagram help please

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It's not correct to say that "for any generic problem like this you must shade in the region outside the circles if we have U".

The reason we have to shade in the outside of the circles is because

A'

contains these outside regions, therefore they must be involved when considering

A' \cup B

. Hence why I simply told you to fully shade in the regions where we have at least one stroke going through, and obviously this includes the outside of the circles.

If we had

A \cup B

, then of course we don't shade in the outside just because we have U in here. You can follow the method I have provided to deduce what this region is (if you dont already know)

if i’m being honest, shading the religion that we don’t have to shade in is making it more difficult for me.

Reply 21

Muttley79

Original post by IH8Studying

i know so i shaded B when it said A’ U B. And what???? and shade everything else?

Sorry i was in the classroom! Shade B or everything not in A - look at the resource the bear has linked.

Reply 22

Muttley79

Original post by IH8Studying

if i’m being honest, shading the religion that we don’t have to shade in is making it more difficult for me.

Yes I would not follow RDKGames advice here.

Reply 23

Muttley79

Original post by RDKGames

No it's not quite there still.

PLEASE do not do this - the exam board does not want this as I said above.

Reply 24

username4952620

Original post by Muttley79

Sorry i was in the classroom! Shade B or everything not in A - look at the resource the bear has linked.

i acc cannot remember all of that so can you help me with my simultaneous question?

am i wrong

Reply 25

Muttley79

Original post by IH8Studying

i acc cannot remember all of that so can you help me with my simultaneous question?

am i wrong

Can you check the question please?
is it
5x + 2y = 11
4x - 3y = 18

Reply 26

Muttley79

Original post by IH8Studying

i acc cannot remember all of that so can you help me with my simultaneous question?

8 - - 15 = 23

Reply 27

username4952620

Original post by Muttley79

Can you check the question please?
is it
5x + 2y = 11
4x - 3y = 18

yes it is

Original post by Muttley79

8 - - 15 = 23

oh so - - in subtraction means plus

Reply 28

ghostwalker

Original post by IH8Studying

i acc cannot remember all of that so can you help me with my simultaneous question?

am i wrong

Please stop spamming the same question over multiple threads. :grr:

Reply 29

Muttley79

Original post by IH8Studying

yes it is

oh so - - in subtraction means plus

Yes, subtracting a negative number means +.

Reply 30

username4952620

Original post by ghostwalker

Please stop spamming the same question over multiple threads. :grr:

it was literally just two threads only and she was online so i asked her as well

Reply 31

username4952620

Original post by Muttley79

Yes, subtracting a negative number means +.

wait. so +8y - - 15? you have to add? but there’s a positive in front of the 8

Reply 32

MathYani

Original post by IH8Studying

wait. so +8y - - 15? you have to add? but there’s a positive in front of the 8

when there are two negative, you add so 8y - (-15) = 8y + 15
Remember these:
+ + = add
+ - = substract
- + = substract
- - = add
so 18 + (-15) = 18 - 15 as it is + -
18 - (+15 ) = 18 - 15 as it is - +
18 - (-15) = 18 + 15 as it is - -
18 + (+15) = 18 + 15

This video should make it easier:
https://www.youtube.com/watch?v=jVvvUiExjes

Reply 33

username4952620

Original post by MathYani

ah okay so is so far correct

Reply 34

MathYani

Original post by IH8Studying

ah okay so is so far correct

I don't understand what you're answering. What is the value of y? Because in the example 20 - 23y = 46 is y = -1 in this case?

Reply 35

username4952620

Original post by MathYani

I don't understand what you're answering. What is the value of y? Because in the example 20 - 23y = 46 is y = -1 in this case?

i really dunno that’s why i’m asking for help

Reply 36

MathYani

Original post by IH8Studying

i really dunno that’s why i’m asking for help

If you are trying to find the value of y. Subtract or add both sides to remove the values and then divide the value tied with the y.

For example in this questions we have:
-17 + 3/4y = 7 what is the value of y?
Well we want y on it's own so lets add 17 both sides to get:
(+17) 3/4y = 7 + 17
Now lets divide by 3/4 to get rid of the 3/4 tied to the y.
(÷3/4) y = 24 ÷ 3/4
y = 32

If you are doing GCSE rn, you should really be understanding all this by now. I recommend you to ask help from a teacher and there are many videos that help with simultaneous equations and basic algebra calculations.

Reply 37

username4952620

Original post by MathYani

my exam is in 8 days. i got a little confused. i’m doing decently thank u

Reply 38

Muttley79

Original post by IH8Studying

my exam is in 8 days. i got a little confused. i’m doing decently thank u

Sorry I was out doing some shopping for a neighbour whose husband died last week :frown:

If you subtract you should have 23y = - 46 so y = -2

Hang in there, you can do it :smile:

Reply 39

username4952620

Original post by Muttley79

Sorry I was out doing some shopping for a neighbour whose husband died last week :frown:

If you subtract you should have 23y = - 46 so y = -2

Hang in there, you can do it :smile:

My neighbours husband died aswell :frown:

it’s really sad. sorry to hear that...

yeah i got that now but i’m kinda confused about this one . i couldn’t have got the signs wrong here

thank you :smile: