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checking maths answers
Factor, and anyone else good at maths, i've done some stuff but can you check them please, I would get my mum or dad or friend to but; i lost mum and dad with most my work in year 9 and my friends are only doing foundation.
1) these are eqations of lines; (P) y=3x+5 (Q) y=4-3x (R) y+3x=1
a) which is parallel to y=3x ? P and Q
b) which goes through the point (2,7) ? S
c) write down the gradient of y+2x=7 ? +7 (is it necessary to say + ?)
And this at the start of a paper but i always find explaining things hard.
2) mike says that 18% or £840 is equal to 36% of £420
explain why he is correct, do not calculate 18% of £840.
18% is half of 36%. and 840 is double 420.
2 (n/2) = n ?????????? i have no idea if that is right.
3)make t the subject of the formula w=2t+v
-v . . . . . w-v=2t
1/2 . . . . (w-v)/2=t
when doing stuff liek that above, i normally draw a vertical line and and jot down my stages, similar to what i've done there, is that a good idea? When checking back over, its easier to spot mistakes i think and its clear to the examiner what i was doing.
1) these are eqations of lines; (P) y=3x+5 (Q) y=4-3x (R) y+3x=1
a) which is parallel to y=3x ? P and Q
b) which goes through the point (2,7) ? S
c) write down the gradient of y+2x=7 ? +7 (is it necessary to say + ?)
And this at the start of a paper but i always find explaining things hard.
2) mike says that 18% or £840 is equal to 36% of £420
explain why he is correct, do not calculate 18% of £840.
18% is half of 36%. and 840 is double 420.
2 (n/2) = n ?????????? i have no idea if that is right.
3)make t the subject of the formula w=2t+v
-v . . . . . w-v=2t
1/2 . . . . (w-v)/2=t
when doing stuff liek that above, i normally draw a vertical line and and jot down my stages, similar to what i've done there, is that a good idea? When checking back over, its easier to spot mistakes i think and its clear to the examiner what i was doing.
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Yes, always explain what you are doing. Write each step separately (many pupils just write an endless stream of nonsense calculations such as 1+1=2 x3=6 +100 =106
I suggest you 'tell a story' to the examiner about what you are doing (eg "subtracting v from both sides"), but in your case be careful as I know you can go on a bit sometimes, lol).
I suggest you 'tell a story' to the examiner about what you are doing (eg "subtracting v from both sides"), but in your case be careful as I know you can go on a bit sometimes, lol).
Mike says that 18% or £840 is equal to 36% of £420. Explain why he is correct; do not calculate 18% of £840.
Well you could say 18% of £840 = 840 x 18/100
840= 2 x 420
18 x 2 =36
so 18% of £840 = 840 x 18/100 can be rewritten as 2 x 420 x (36/2)/100
which in turn can be rewritten thus:
2 x 420 x (36/2)/100 = 420 x 36/100.
Now 36% of £420 = 420x 36/100
The two are identical.
But that's a bit long winded isn't it.
If it's worth only one mark I'd go for your explanation- they simply want you to show you know that y% of 2n is the same as 2y% of n
Well you could say 18% of £840 = 840 x 18/100
840= 2 x 420
18 x 2 =36
so 18% of £840 = 840 x 18/100 can be rewritten as 2 x 420 x (36/2)/100
which in turn can be rewritten thus:
2 x 420 x (36/2)/100 = 420 x 36/100.
Now 36% of £420 = 420x 36/100
The two are identical.
But that's a bit long winded isn't it.
If it's worth only one mark I'd go for your explanation- they simply want you to show you know that y% of 2n is the same as 2y% of n
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