box of chalk and 2 staplers cost $10.00. Three boxes of chalk and 2 staplers cost $18.00. How much is a box of chalk and a stapler?

Answer 1

x is box of chalk
y is staplers

x + 2y = 10
3x + 2y = 18

solve for x and then plug in and solve for y

Answer 2

x+2y=10
3x+2y=18
Multiply the first equation by -1 to cancel the y's:
-x-2y=-10
3x+2y=18
Now add the rows
2x=8
x=?
Now plug that back into either original equation to solve for y.

Answer 3

16

Answer 4

the answer is