Answer:

Step-by-step explanation:
Consider an equation: 
Here, m is the slope of the line and c is the y-intercept.
Given equation is 
Here, slope is 
As product of slopes of two perpendicular lines is equal to
, slope of the required line is
.
Let 
Equation of the required line is 

Answer:
3
Step-by-step explanation:
BC
AC
BA
Answer:
15
Step-by-step explanation:
60/4 =15
12 inches, 180/30 is 6 and 2x6 is 12
Answer:
Step-by-step explanation:
5x - 40 = 20
5x = 20 + 40
5x = 60
x = 60/5
x = 12