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If m 17 27 90 63 ** picture is attached

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.