Math
posted by Steph .
Speedy Printing charges $23 for 200 deluxe business cards and $35 for 500 deluxe business cards. Give that the cost is a linear function of the number of cards printed, find a formula for that function and find the cost of 700 business cards.

Someone please help me with this!
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ATTENTION TEACHERS AND STUDENTS
Mrs. Matthew called me stupid for not knowing the answer to this so...May I please get some proper help?