If 8 bags of grapes cost $20.00, how much do 3 bags of grapes cost?

Let cost of one bag be Y

8 x Y = $20

So, Y = $2.5

Now cost of 3 bags = 3 x 2.5 = $7.5

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb