Ab and bc form a right angle at point b. if a = (-3, -1) and b = (4, 4), what is the equation of bc ?

a.
x + 3y = 16
b.
2x + y = 12
c.
-7x − 5y = -48
d.
7x − 5y = 48

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

Write the slope intercept equation for line ab.