February 25, 2017

Homework Help: algebra

Posted by Josie on Wednesday, March 6, 2013 at 7:37pm.

A shipment of 18 cars, some weighting 3000lbs a piece, and the others weighing 5000 lbs each, has a total weight of 30 tons. Find the number of each kind of car.

I start of saying X+Y = 18. THen I turn that into X=18-Y. whats next??
thank you for helping if u can.

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