How do I find how many times a line intersects?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Is (0,0) a to ? ys x2 - 4 y> 2x-1