Question

Line g has a slope of 7/9. Line h is perpendicular to g. What is the slope of line h ?

Answer 1

The slope of line h is -9/7

Explanation:

mathematically, for two lines that are perpendicular to each other, the product of their slopes is equal to -1

say we have two lines l1 and l2, the product of their slopes m1 and m2 is -1

Mathematically;

m1 * m2 = -1

now, m1 here is 7/9 , we now proceed to calculate m2

7/9 * m2 = -1

7m2/9 = -1

7m2 = -9

m2 = -9/7