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Starla bought cloth napkins at an outlet store for $3.50 each, and she also used a $15 off coupon. In the equation below, x represents the number of napkins, and y represents the cost before tax. y = $3.50x - $15 If Starla paid $55.00 before tax, how many napkins did she buy? A. 20 B. 2 C. 16 D. 21

Respuesta :

Ben

A. 20

Begin by substituting the known value. I have removed the symbols for now just to make the equation easier to read. 55 = 3.5x - 15

Add 15 on both sides of the equation to cancel out the subtraction. 70 = 3.5x

Finally, divide both sides by 3.5 to cancel out the subtraction. 20 = x

So, Starla bought 20 napkins.

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