How do you use the sum and difference formulas to verify identities?

I uploaded the answer to a file hosting. Here's link:

cutt.ly/nz6VGda

x

step-by-step explanation:

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)