Why is subtracting an expression similar to distributing a –1? Use the drop-down menus to explain your answer. plz help im beggin yall

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You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.