Why is there an apostrophe in my formulae?

Hi. I'm new to maths... And I need help on a simple fraction.

How do I answer question f? (See attached image).
How do I multiply x by an apostrophe?
I don't get it.

Am trying to self study maths A level and am struggling at the first hurdle. Eeeeek.

Is it not a comma? Just separating the y = ... from the x = ...

Reply 2

rayquaza17

17

Original post by limegreenjello

Hi. I'm new to maths... And I need help on a simple fraction.

How do I answer question f? (See attached image).
How do I multiply x by an apostrophe?
I don't get it.

Am trying to self study maths A level and am struggling at the first hurdle. Eeeeek.

I think we need to see all of the question to help you with this.

Could you post a picture of all of question 6?

Reply 3

username878045

17

Original post by limegreenjello

Hi. I'm new to maths... And I need help on a simple fraction.

How do I answer question f? (See attached image).
How do I multiply x by an apostrophe?
I don't get it.

Am trying to self study maths A level and am struggling at the first hurdle. Eeeeek.

That's two equations separated by a comma, not a single equation.

Reply 4

BabyMaths

Original post by limegreenjello

Hi. I'm new to maths... And I need help on a simple fraction.

How do I answer question f? (See attached image).
How do I multiply x by an apostrophe?
I don't get it.

Am trying to self study maths A level and am struggling at the first hurdle. Eeeeek.

I'm guessing that you need to work out y in its simplest for a particular value of x.

in (f) you have

y=\frac{6}{5x}

and you need to find y when x=3/2.

So simplify

\frac{6}{5 \times \frac{3}{2}}

Reply 5

limegreenjello

OP

2

Original post by bartonhollow

Is it not a comma? Just separating the y = ... from the x = ...

Oh wow. I didn't even notice how all the others had the same thing. Thank you very much.

Reply 6

username1471603

8

Original post by limegreenjello

Oh wow. I didn't even notice how all the others had the same thing. Thank you very much.

No problem at all! Glad to have helped :biggrin:

Reply 7

limegreenjello

OP

2

So, how likely is it that my text book has a misprint?

6/5x where x = 3/2

6 x 3 = 18
5 x 2 = 10

= 18/10 = 1 4/5

The book's answer to the above equation is 4/5.

But my answer is 18/10 or 1 4/5 simplified.

Where am I going wrong?

Reply 8

TenOfThem

18

Original post by limegreenjello

So, how likely is it that my text book has a misprint?

6/5x where x = 3/2

6 x 3 = 18
5 x 2 = 10

= 18/10 = 1 4/5

The book's answer to the above equation is 4/5.

But my answer is 18/10 or 1 4/5 simplified.

Where am I going wrong?

You are calculating

\dfrac{6}{5}x

The question asked for

\dfrac{6}{5x}

Reply 9

username1471603

8

You would multiply 5 by 3/2 because it's 5x on the bottom, right? That would give you 15/2, you'd have 6 on the top, over 15/2, then multiply both parts by 2 to get rid of the fraction on the bottom, giving 12/15, then simplify it to 4/5 :smile:

Reply 10

davros

16

Original post by limegreenjello

So, how likely is it that my text book has a misprint?

6/5x where x = 3/2

6 x 3 = 18
5 x 2 = 10

= 18/10 = 1 4/5

The book's answer to the above equation is 4/5.

But my answer is 18/10 or 1 4/5 simplified.

Where am I going wrong?

The book is correct :smile:

I don't know what you're trying to do but you should be working out 5x = 15/2 and then working out 6 divided by this.

Reply 11

limegreenjello

OP

2

Oh you are intelligent. I wish I got this. Thank you again, all.

Reply 12

rayquaza17

17

Original post by limegreenjello

Oh you are intelligent. I wish I got this. Thank you again, all.

It's an easy mistake to make.

I remember when I was learning about scatter graphs, and I thought it said "s catter graphs" and I was so confused why it was called that.

:smile: