Help on geometry plz find b

The table respent two linear functions the equation respented by the first tables is given

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.