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P1 = (0, 3)
P2 = (1,6)
1.- Find the slope
m = (y2 - y1) / (x2 - x1)
m = (6 - 3) / (1 - 0)
m = 3/1
m = 3
2.- Find the equation of the function
y - y1 = m(x - x1)
y - 3 = 3(x - 0)
y - 3 = 3x
y = 3x + 3 This is the equation of the function
3.- This is a linear function. The domain of a linear function is all real numbers and the range of a linear function are also all real numbers.