Luis is saving money to purchase a new video game. he has a total of 30 coins consisting of nickels and dimes. the value of the coins is $2.20. let n represent the number of nickels and let d represent the number of dimes. which system of equations can be used to determine the number of nickels and the number of dimes luis has?

and

Step-by-step explanation:

Let n represent the number of nickels

Let d represent the number of dimes.

Luis has a total of 30 coins; equation becomes:

or   ..... (1)

The value of the coins is $2.20 ; equation becomes:

{a dime is worth 10 cents and a nickel is 5 cents}

  ..... (2)

Putting the value of n from (1) in (2)

=>

=>

=>

=> d=14

And n=30-d

so,

So, the system of equations used to determine the number of nickels and the number of dimes Luis has are :

and

the first question mark is 6 and the second question mark is 26 (the square root)

step-by-step explanation:

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