Seven times the first number plus six times the second number equals 31

Step-by-step explanation:

Let the first number be x and the second number be y

according to the question:

7x+6y=31

Step-by-step explanation:

6 times the number is 6x.

7 times the number is 7x.

6 times the number plus 7 times the number is equal to 6x + 7x which is equal to 13x.

for example:

let x = 15

6x = 6 * 15 = 90

7x = 7 * 15 = 105

6x + 7x = 6 * 15 + 7 * 15 = 90 + 105 = 195