hello all.

I have a problem with this question:

1 pencil and 1 pen cost $8 together.

2 pencils and 3 pens cost $21 together.

What the cost of 1 pencil and 1 pen?

I know that the answer is $3 for a pencil and $5 for a pen, but i don't know what equation to use.

I appreciate any help on this.

thanks.

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