ELECTRONICS The equations P = 7m + 137 and C = 4m + 78 represent the number of cell phones P and digital cameras C sold in m months at an electronics store. Write an equation for the total monthly sales T of phones and cameras. Then predict the number of phones and cameras sold in 10 months. To write an equation that represents the total sales T, add the equations that represent the number of cell phones P and digital cameras C. T = 7m + 137 + 4m + 78 = 11m + 215ed ned Bin Rashid Substitute 10 for m to predict the number of phones and cameras sold in 10 months. T = 11(10) + 215 = 110 + 215 or 325 Therefore, a total of 325 cell phones and digital cameras will be sold in 10 months. GuidedPractice 5. Use the information above to write an equation that represents the difference in the monthly sales of cell phones and the monthly sales of digital cameras. Use the equation to predict the difference in monthly sales in 24 months.

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