Question

Line m is perpendicular to x - 3y =-1 and passes through (9, 4). What is the slope of line m?

A. 1/3
B. -3
C. 4
D. 3 ​

Answer 1

d)3

Explanation:

y=mx+b

x-3y=-1

reform as the equation above

x+1=3y

simplify --> y=1/3x+1/3

perpendicular lines have opposite-reciprocal slopes

so the answer is 3