12 The table shows the original price of pencils. Which equation represents the price of pencils if they are on sale for half off? Number of Pencils, x Price (S), y 1 0.50 2 1.00 1.50 4 2.00 2.50​

1 is c

2 is a

3 is a

step-by-step explanation:

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.

i believe that the answer is

b. y-1=-2(x-4)

hope this !