GCSE Maths Help and Chat Thread

Original post by _gcx

Divide both sides by 3. You will then be able to plot it like any other line (using a table etc.)

Ok so 3/3 is y and 6/3 is 2 so y=2x+2. Is that correct?

Reply 62

Original post by _gcx

Divide both sides by 3. You will then be able to plot it like any other line (using a table etc.)

Also if I come across another equation like this, is the rule the same? Do you divided both sides by the first part ?

Reply 63

BobBobson

Original post by Zonyali123

Also if I come across another equation like this, is the rule the same? Do you divided both sides by the first part ?

You do whatever you need to do to get y= on the left side. Have you done changing the subject of a formula? You may need to collect like terms, expand brackets / factorise or add and minus stuff from both sides as well as dividing and multiplying.

Posted from TSR Mobile

Reply 64

Notnek

Original post by g_a1

Sorry why is there 4 days left

You have two stages to make the bottles:

Stage 1 is done by 4 machines in 2 days
Stage 2 is done by 8 machines in n days

And we know that 8 machines take 5 days in total to make the bottles.

4 machines in 2 days do the same amount of work as 8 machines in 1 day. So you can imagine that stage 1 is actually done by 8 machines so you have:

Stage 1 is done by 8 machines in 1 day
Stage 2 is done by 8 machines in n days

Since it takes 5 days in total for 8 machines to make the bottles, stage 2 must take 5 - 1 = 4 days.

Then since stage 1 actually took 2 days, the total process takes 2 + 4 = 6 days.

Reply 65

Original post by Zonyali123

Ok so 3/3 is y and 6/3 is 2 so y=2x+2. Is that correct?

You have forgot to divide the 2x by 3, unless that was a typo in your previous post. (3y = 2x + 6)

Reply 66

Original post by _gcx

You have forgot to divide the 2x by 3, unless that was a typo in your previous post. (3y = 2x + 6)

Sorry it wasn't a typo, but if I divide 2x by 3 I get 0.6.

Reply 67

g_a1

Original post by Frazzle27

Yes!!! I get it thanks :smile:

)

Posted from TSR Mobile

Reply 68

Original post by Zonyali123

Sorry it wasn't a typo, but if I divide 2x by 3 I get 0.6.

I have studied the slope intercept form, and you leave 2/3 as it is, so it's y=2/3+2. However, I want to know whether there is another way of doing this, as this way is confusing me. I know I have to start on 0 on the y axis then I go 2 up (vertically)as I should add 2. Then 2 up again (vertically)and 3 horizontally right, but after that I don't know what to do.

Reply 69

Original post by Zonyali123

Sorry it wasn't a typo, but if I divide 2x by 3 I get 0.6.

You should leave it as a fraction, don't try to round it.

Reply 70

Original post by Zonyali123

If that method is confusing you, use a table with

x

in one column and

y

in the other, and plot the points like that.

Reply 71

Original post by _gcx

If that method is confusing you, use a table with

x

in one column and

y

in the other, and plot the points like that.

Can you please tell me how I should make a table? I have made tables for other equations but I was given the numbers, but in this question, I've not been given any numbers.

Reply 72

Original post by Zonyali123

Can you please tell me how I should make a table? I have made tables for other equations but I was given the numbers, but in this question, I've not been given any numbers.

•

In the $x$ column, put the values that you're asked for. If you're given the range "between 0 and 3", for example, write the natural numbers between 0 and 3.

•

To get the $y$ value, substitute each corresponding $x$ value into the original equation. For example, given $x=3$ , the equation would be $\frac{2}{3}(3)+2$ , which would evaluate to $y=\frac{6}{3}+2$ (which is $2+2$ ), which further evaluates to $y=4$ . Therefore, when $x=3$ , $y=4$ , and you would add it to the table as such.

Reply 73

Original post by _gcx

•

In the $x$ column, put the values that you're asked for. If you're given the range "between 0 and 3", for example, write the natural numbers between 0 and 3.

•

So I multiply the numbers in the x column by 2/3 then I add 2 which gives me the answer to y. Is this correct?

Following thread 😊

Original post by Zonyali123

So I multiply the numbers in the x column by 2/3 then I add 2 which gives me the answer to y. Is this correct?

Yes

Reply 76

Original post by _gcx

Yes

Thanks for your help. You explained everything very clearly 😁

Reply 77