Posted by **Celina** on Tuesday, December 16, 2008 at 4:24pm.

I'm a little confused on how to solve this:

The number of cricket chirps per minute is given by

N(t) = 7.2t - 32

Where t is the temperature in degrees Celsius.

a. Graph the equation N(t) = 7.2t - 32

I have learned a few ways to graph equations. One way would be to use -32 as the y-intercept and from there go up 7.2, over 1, etc. The other way would be to pick an x, or in this case, t value, multiply it by 7.2, subtract 32, and that would be the y value. I have tried both ways and gotten different results, so which way would be correct?

Thank you very much! Any help is appreciated!

- algebra -
**Reiny**, Tuesday, December 16, 2008 at 5:24pm
both ways are correct, you must have made an error

method 1 - slope y-intercept

one point is obviously (0,-32)

now from there go up 7.2 then to the right 1

this would give you (1,-24.8)

join these two points

method 2: finding random ordered pairs

let t = 1, N(1) = 7.2-32 = -24.8 -- (1,-24.8)

let t = 3 N(3) = -10.4 --- (3,-10.4)

join these points, bet you get the same line

- algebra -
**Celina**, Tuesday, December 16, 2008 at 7:17pm
Thank you so much!

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