- How to solve the linear system using substitution 4x-y=5 4x+4y=-4?

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How many moles of NH3 are produced when 1.8 moles H2 reacts? The population of a certain town is 27,000 and is doubling every 4 years. When will population reach 90,000? Please show steps!? Does adding honey to food help it last longer? 2272.59 is what percent of 5,353.04? In what type of tectonic plate boundary is land pushed together and upward to form mountains?