Hello, /trash/.
I have a question for you.
Susan bought 3 binders and 2 packages of paper for $13.35
Dante bought 2 binders and 4 packages of paper foe $17.30
How much did each binder cost?
>Assumption: no tax
>Assumption: bought from the same place with any discounts/sales/promotions/specials/whatever applying to both or neither
>3x+2y=13.35 (1)
>2x+4y=17.3 (2)
>17.3-13.35=3.95 (2)-(1)=(3)
>2y-x=3.95 (3)
>x+2y=8.65 (2)/2=(4)
>2y=3.95+x (3)
>2y=8.65-x (4)
Thus, x is the difference between 3.95 and 8.65 or $2.35 as reinforced below.
>2y=2y (3)=(4)
>3.95+x=8.65-x (3)=(4)
>3.95+2x=8.65
>2x=4.70
>x=2.35
Then, we can plug that back in to the original 2 to find y.
>3x+2y=13.35
>3(2.35)+2y=13.35
>7.05+2y=13.35
>2y=6.3
>y=3.15
And again for the 2nd equation to double check I didn't fuck up.
>2x+4y=17.3
>2(2.35)+4y=17.3
>4.7+4y=17.3
>4y=12.6
>y=3.15
Thus, x is 2.35 and y is 3.15.
Anything else?
>>5389418
You didn't say how much the binders cost.
>>5389520
X is binders, Y is packages.