find the distance between the point (1, 2) and the line y= 4x+ 1
Let d be the sought distance, then, if M(1,2) and l:4x-y+1=0
"d={\\frac {|l_x*M_x+l_y*M_y+1|} {\\sqrt{l_x^2+l_y^2}}}={\\frac {|4*1-1*2+1|} {\\sqrt{16+1}}}={\\frac {3\\sqrt{17}} {17}}"
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