Open Middle®
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box so that there are infinitely many solutions to the system of equations.
Hint
What makes a solution have infinitely many solutions? How can you use that to start filling in the boxes? Are there multiple possibilities?
Answer
Here is one of many possibilities:
Both linear equations must be multiples of one another.
Source: Nanette Johnson