Question

Which line is perpendicular to the line y=2/3x + 3

Answer 1

Lines that are perpendicular to each other have the product of their slopes equal to -1.
For example,
y=(3/4)x+5 has a slope of 3/4
y=-(4/3)x-6 has a slope of -4/3
The product of their slopes is (3/4)*(-4/3)=-1, so theses two lines are perpendicular to each other.

Answer 2

Thank you very much mathmate for your help! I found my answer

Answer 3

You're welcome! :)