Posted by **hayden** on Tuesday, October 5, 2010 at 8:00pm.

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?

- math -
**lindsey**, Tuesday, October 5, 2010 at 8:03pm
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

- math -
**Jen**, Tuesday, October 5, 2010 at 8:23pm
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.

- math -
**Anonymous**, Friday, June 13, 2014 at 8:46pm
16

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