How to use the Keypad:

• Press the button that is the SOLUTION to the question bellow

• The PIN is FOUR numbers

• If you input the wrong number the code resets

• BE CAREFUL! The questions COULD change

• Once all FOUR correct numbers are entered you will gain entrance to the building

• RESET starts the PIN over

CLUE TO THE BUTTON:

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What is the slope of the equation: 

  -15x+3y=-18