Using the given equation find the missing coordinates of the points and then find the slope of the line for each equation: a) y = 3.5x + 4; A(...; 5), B(10; ...)

b)7x − 5y = 12; A(...; 9), B(4; ...)

c)y = − 37 x +3; A(...; 6), B(9; ...)

d)y = 0.3x + 1; A(...; 9), B(5; ...)

please answer asap
ty :P

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?