Question

challenge #1 alina put a number into this machine, and 13 was the output. what was the input? add 8

Explanation:

Step1: Define the operation

The machine adds 8 to the input number to get the output. Let the input be \( x \). So the equation is \( x + 8=13 \).

Step2: Solve for x

To find \( x \), we subtract 8 from both sides of the equation: \( x = 13 - 8 \).

Step3: Calculate the result

\( 13 - 8 = 5 \).

Answer:

5