exam Maths Puzzle Numerical Ability

y=-1/2x +1

if x = -2
if x = -1

if y = 1
if y = 1/2

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Thank You Can you help me solve my word problem...instructions...the cost in dollars of manufacturing (w)wing nuts is given by the xpression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut?