Posted by xavier on Monday, January 7, 2013 at 6:07am.
y = -(5/6)x for the first line, so the slope of your second (parallel) line is also -5/6. Its equation is
y' = -(5/6)x + C
C is the y-intercept of the second line.
You have to choose C so that y and y' are sqrt61 apart.
C is the hypotenuse of a right triangle with sides sqrt61 and (5/6)*sqrt61. Its value is sqrt[61 + (25/36)*61]
= sqrt[(61/36)*61] = 61/6
The line you want is
y' = (-5/6)x + 61/6
There is a second line that is also a solution, below the first line
y' = (-5/6)x - 61/6
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