Answer the riddle bellow A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

When graphing a linear equation that is written in the form y=mx+b, the variable m represents the y-intercept. assuming that b> 0, which of the following best describes how reversing the sign of b would affect the graph? a) the new line will be shifted down b units b) the new line will be shifted down b x 2 units c) the new line will be a perfect reflection across the x-axis d) the new line will be a perfect reflection across the y-axis

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How do you work out 21.3-8= show your working. plz