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Coordinate geometry

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Reply 40
Avatar for Robbie242
Robbie242
Original post by strangepath
so its
y-35 = 0.01(x-1000)
0 = 0.01x -y + 25?

Yes that is a way to write it but rather have it in the form y=mx+cy=mx+c
so y=0.01x+25y=0.01x+25 looks much more better
Reply 41
Avatar for joostan
joostan
13
Original post by strangepath
so its
y-35 = 0.01(x-1000)
0 = 0.01x -y + 25?


Yes - though leaving it in the form y=mx + c is more conventional, or if you wished to write it as you have done, then x - 100y + 2500 = 0 is a neater way of writing it :smile:
Reply 42
Avatar for dudefrom93
dudefrom93
OP
11
Original post by Robbie242
Yes that is a way to write it but rather have it in the form y=mx+cy=mx+c
so y=0.01x+25y=0.01x+25 looks much more better

Cool thanks :biggrin:
so for question b the answer is $65 for 4000 minutes per month?
Reply 43
Avatar for Robbie242
Robbie242
Original post by strangepath
Cool thanks :biggrin:
so for question b the answer is $65 for 4000 minutes per month?

Yup!
Reply 44
Avatar for dudefrom93
dudefrom93
OP
11
Original post by Robbie242
Yup!

so the answers are for question
a) m = 0.01 and y= 0.01x + 25
b) $65 for 4000 minutes per month. (could you elaborate on this one? I don't know if I should write just $65 without explanation)
Reply 45
Avatar for joostan
joostan
13
Original post by strangepath
so the answers are for question
a) m = 0.01 and y= 0.01x + 25
b) $65 for 4000 minutes per month. (could you elaborate on this one? I don't know if I should write just $65 without explanation)


You could write 4000*0.01 + 25 = y =65
Reply 46
Avatar for Robbie242
Robbie242
Original post by strangepath
so the answers are for question
a) m = 0.01 and y= 0.01x + 25
b) $65 for 4000 minutes per month. (could you elaborate on this one? I don't know if I should write just $65 without explanation)
As joostan said, write out the solution to get to 65 and your good otherwise, no explanation needed, it simply said you need to find the cost, but it is best to show your working.
Reply 47
Avatar for dudefrom93
dudefrom93
OP
11
Original post by Robbie242
Yup!

Original post by joostan
You could write 4000*0.01 + 25 = y =65

Thank you all so much for your help. :biggrin:
Reply 48
Avatar for Robbie242
Robbie242
Original post by strangepath
Thank you all so much for your help. :biggrin:
Anytime :biggrin:
Reply 49
Avatar for dudefrom93
dudefrom93
OP
11
IMG_0534[1].jpgIMG_0536[1].jpg are these two correct?
Reply 50
Avatar for Robbie242
Robbie242
Original post by strangepath
IMG_0534[1].jpgIMG_0536[1].jpg are these two correct?
Yes, have confidence in yourself! it is the key to being good at maths :biggrin: (as well as practice)

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