# math

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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 -

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 -

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

• math -

16

• math -

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