The equation which describes the relationship between these two variables is 39.91 = 3.99p + 4.99b
Given:
<em>Cost of each box of pencil</em> = $3.99
<em>Cost of each box of pen </em>= $4.99
<em>Total cost</em> = $39.91
let
p = <em>number of boxes of pencils</em>
b = <em>number of boxes of pens</em>
The equation:
<em>Total cost = (Cost of each box of pencil × number of boxes of pencils) + (Cost of each box of pen × number of boxes of pens)</em>
39.91 = (3.99 × p) + (4.99 × b)
39.91 = 3.99p + 4.99b
Therefore, equation which describes the relationship between these two variables is 39.91 = 3.99p + 4.99b
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