High School

Eleven times one number is 9 more than 8 times another number. The first number minus four is half the second number. Find the numbers.

Answer :

By creating and solving a system of equations from the provided conditions, the two numbers in question are identified as 11 and 14.

The student presents a system of equations that can be expressed as follows:

  • 11x = 9 + 8y (Equation 1)
  • x - 4 = {1}/{2}y (Equation 2)

From Equation 2, we can express y in terms of x:

  • y = 2(x - 4)

Substitute y in Equation 1:

  • 11x = 9 + 8[2(x - 4)]
  • 11x = 9 + 16x - 64
  • 5x = 55
  • x = 11

Now, using x to find y:

  • y = 2(11 - 4)
  • y = 2(7)
  • y = 14

Therefore, the two numbers are x = 11 and y = 14.