The point is and the equation of line is .
The equation is in the form where m is slope and b is y - intercept.
Therefore slope of given line is .
Because the slopes of perpendicular lines are negative reciprocals, the slope of perpendicular line through is 2.
To find the y - intercept, substitute the values of in the slope - intercept from of equation and solve for b.
Subtract 4 from each side.
.
The y - intercept of perpendicular line is .
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