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Bunuel
Line l is defined by the equation y = 3x - 5. If lines l and k intersect to form a right angle at the point (3,4), which of the following is the equation of line k?


A y = −3x + 6

B y = −3x + 10

C y = 3x + 10

D y = −x/3 + 5

E y = −x/3 + 6


substitute for values and (3,4 ) and test for values where we get x & y as ( 3 & 4)
IMO D is correct
also slope of line l * slope of line k = -1
line l slope = 3; line k slope = -1/3 so 3 * -1/3 = -1
D is correct
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