exam Maths Puzzle Numerical Ability

Make a conjecture concerning the decimal values in the approximation of common logarithms of numbers greater than 1 that have the same digits if:

log 398.4 = 2.6003
log 39.84 =

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5^(5/2) My problem is to write the equation of the line with slope -1/2 and y - intercept (0,3). Then graph the line. My answer is y = -1/2x + 3. Is this correct?