One number is nine less than a second number. Three times the first is 12 more than 4 times the second. Find the numbers. The value of the first number is

Step-by-step explanation:

Let the first number be x

Let the second number be y

x = y - 9

3x = 4y + 12

3x - 4y = 12

3(y - 9) - 4y = 12

3y -4y - 27 = 12

-y = 12 + 27

-y = 39

y = -39

x = y - 9

x = -39 - 9 = -48

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