Explanation:
Use the distance formula ( a modified Pyhtagorean theorem)
d^2 = (x1-x2)^2 + ( y1-y2)^2
d^2 = ( -6 - -9)^2 + ( -1 - -6)^2
d^2 = ( 3^2) + ( 5^2)
d^2 = 34
d = sqrt (34 ) =~ 5.8 units
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