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gustanika
For an instance, i stands for the money that you have, and b stands for the money that brother has.
An equation system based on the problem would be
i + b = 42 (equation 1)
i = 3b (equation 2)

Use substitution method to solve the problem
substitute 3b into i in the equation 1
i + b = 42
3b + b = 42
4b = 42
b = 42/4
b = 10.5

substitute the value of b into the equation 1
i = 3b
i = 3(10.5)
i = 31.5

You have $31.5 and your brother has $10.5

The person has 3*11.5 = $34.5 and the person's brother has $11.5 amount with them.

What is an Equation ?

A mathematical statement made up of two expressions joined by an equal sign is called an equation.

It is given that the person has three times as much money has his brother.

Let the person's brother has $x amount of money .

Then the person will have $ 3x amount of money

They have $42 in total

so the equation that we can write is 3x+x = 42

4x = 42

x = 42/4

x =$11.5

Therefore the person has 3*11.5 = $34.5

and the person's brother has $11.5 amount with them.

To know more about equation

https://brainly.com/question/10413253

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