1.2 Linear Equations

Question 1

The sum of the angles of a polygon with /n/ sides is what?

Answer 1

S = 180(n-2)

How? Try dividing a polygon into triangles

Question 2

What is the difference between an equation and identity?

Answer 2

An identity is true for ALL values of x, not just a single value.

For example:
5(x - 1) = 5x - 5

if x equals 1: 5(1 -1) = 5(1) - 5
The answer is 0 = 0.
if x equals 2: 5(2-1) = 5(2) - 5
The answer 5 = 5