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# Coordinate geometry Watch

1. (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
so looks much more better
2. (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
3. (Original post by Robbie242)
Yes that is a way to write it but rather have it in the form
so looks much more better
Cool thanks
so for question b the answer is \$65 for 4000 minutes per month?
4. (Original post by strangepath)
Cool thanks
so for question b the answer is \$65 for 4000 minutes per month?
Yup!
5. (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)
6. (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
7. (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.
8. (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.
9. (Original post by strangepath)
Thank you all so much for your help.
Anytime
10. are these two correct?
11. (Original post by strangepath)
are these two correct?
Yes, have confidence in yourself! it is the key to being good at maths (as well as practice)

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