The amount of the change he can get back at the cash counter will be 21.
<h3>What is the linear system?</h3>
A Linear system is a system in which the degree of the variable in the equation is one. It may contain one, two, or more than two variables.
In a supermarket, the cost of 1 kg of pork, fish, and prawns is RM 3, RM 7, and RM 13 respectively. Ronald has to buy at least 3 kg of pork, 1 kg of fish, and 1 kg of prawn for tonight's dinner for RM 50.
Let the weight of pork be x, fist be y, and prawns be z. And let A be the amount.
Then the linear equation will be given as
3x + 7y + 13z = A
Then the amount of money if Ronald has to buy at least 3 kg of pork, 1 kg of fish and 1 kg of prawn for tonight's dinner will be
A = 3 × 3 + 7 × 1 + 1 3 × 1
A = 9 + 7 + 13
A = 29
More about the linear system link is given below.
brainly.com/question/20379472
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