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Get HelpNavigate using the menu above to get help from your teacher in your year… 14 comments to Get Help |
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Copyright © 2012 The Sydenham High School Mathematics Department Blog - All Rights Reserved |
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Hi mrs tibble
Hope i got it right!!!!!
yay, Mr brewin changed the yr 9 thingy 2 Mrs Tibble/Mr Atkins!
I am stuck on question 3, Exercise 6F, page 132. I don’t get the y≤1/2x bit
. Can somebody help me pleeeeease?
Hi Sophie,
What does the line y = 0.5x look like? If you aren’t sure, then choose some x values, use the equation to work out the y value, then plot the points.
For the inequality, y < or = 0.5x so you need to be below the line.
Does that help?
JT
sort of… for the line y=0.5x, does the line go through 0.5 or is that the gradient? thanks.
Sophie, 0.5 is the gradient! Put values in: if x = 0, then y = 0.5 x 0 which = 0, so the line goes through the origin.
ohhhhhh! i understand it now, thank you
Hi mrs tibble, im not in your maths group but miss dailey isnt answering my question, how do you do 2.1×10 squared?
Hi Erin,
10 squared is 10×10 which is 100 so multiply 2.1 by 100.
JT
For the exam in the new year, do we have to learn about the difference of two squares – I cannot remember learning about it!
And do we have to know how to construct a formula from words and how to rearrange a formula?
Hi Emma,
You haven’t used your school e-mail address so don’t know which Emma/year group you are.
If you are Year 10 or 11 then yes. You will have done the difference of two squares when you did quadratics: multiplying out 2 brackets, and factorising quadratics.
Have a look here:
http://www.mathsteacher.com.au/year10/ch10_factorisation/03_dots/dots.htm
2nd question – yes if you are year 11.
If you are year 10 look at the revision list you were given in class rather than the guide.
JT
Oh no I am in year 9 .. sorry
Hi Emma,
Constructing simple formulae from words – yes
Rearranging – yes; you need to be able to do this to solve equations.
Difference of 2 squares: only if you did it when you were factorising quadratics. If not, don’t worry about it.
JT