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

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Equivalent equation of x= 5^-2? Find the area of the region common to the circles r= -10cos(x) and r= 5 ? Biology
why are pyramids of biomass and numbers similar? If 48 eV energy is required to move charge through a potential difference of 12 V, determine the charge involved.? Biology q:
why are pyramids of biomass and numbers similar to the pyramid of energy?

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