6) bill opened a savings account with
$500. he added $100 per month. after x
months, he had $2100.
create an equation that could be used to
find how many months it took to save
$2100.

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.