Fixed price per kg = R "3"
Let certain fixed amount that is added be "C"
Let "a" customers buy "x" kg
Let amount to be paid be R "y"
"y= 3x+C"
Now hence,
"x= 4"
"y= 14"
"14=3(4)+C"
"C= 2"
Hence equation is
"y= 3x+2"
Where "y" is the total amount and "x" is number of kg
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