posted by hayden on .
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?
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
Multiply the first equation by -1 to cancel the y's:
Now add the rows
Now plug that back into either original equation to solve for y.
the answer is