First number plus twice a second number is 8. twice the first number plus the second totals 31. find the number

1st number = 18

2nd number = -5

Step-by-step explanation:

Let x be first number and y be the 2nd number.

We have been given that first number plus twice a second number is 8. We can represent this information as:

We are also given that twice the first number plus the second totals 31. We can represent this information as:

Now let us solve our system of equations using substitution method.

From equation (1) we will get,

Substituting in equation (2) we will get,

Therefore, the second number is -5.

Now let us substitute y=-5 in equation (1).

Therefore, the first number is 18.

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step-by-step explanation:

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