Vinyl and CD Sales During the 1980s, sales of compact discs surpassed vinyl record sales. From 1985 to 1990, sales of compact discs in millions can be modeled by the formula f(x) = 51.6(x − 1985) + 9.1, whereas sales of vinyl LP records in millions can be modeled by g(x) = −31.9(x − 1985) + 167.7. Approximate the year x when sales of LP records and compact discs were equal by using the intersection-of- graphs method. (Source: Recording Industry Association of America.)
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