we let y = the degrees in Celsius and x = the degrees in Fahrenheit.
The freezing point of water in Celsius is 0°.
The freezing point of water in Fahrenheit is 32°.
So one ordered pair is (x1,y1) = (32,0).
The boiling point of water in Celsius is 100°.
The boiling point of water in Fahrenheit is 212°.
So another ordered pair is (x2,y2) = (212,100).
So we find the equation of the line through those two points (ordered pairs).
We use the slope formula:
where (x1,y1) = (32,0)
and where (x2,y2) = (212,100)
After you find m (which will be a fraction, which you will reduce), substitute
it into
the point-slope formula:
y - y1 = m(x - x1)
where (x1,y1) = (32,0)
You finish this.
After you finish you might substitute C for y and F for x.
Edwin