Annel sells a phone which costs $180 and earns $9 commission. If he sells $640 worth of phones the following day, how much will he earn on commission?

y=-2.5x+12.5

step-by-step explanation:

5y=2x+10

y=0.4x+2

slope=-2.5

5=-2.5*3+b

b=12.5

it is a secret for it not to be compromised sorry

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)

answer is b 270°

i got it down for you chief.