# College algebra

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a company finds it can produce 15 heaters for \$4300, while producing 20 heaters costs \$5500. Express y, as a linear function of the number of heaters, y. Determine the cost to produce 30 heaters.

y = _________

Cost to produce 30 heaters \$_________

Help I'm not sure how to solve this problem. Thank you

• College algebra -

y=mx+b
4300=m*15+b
5500=m*20+b

subtract the first from the second
1200=5m
m= you solve it. THen put it in either equation, and solve for b.

• College algebra -

Thank you so much. I can't believe it was so simple..:):)

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