7x-6y=42 find the slope of the line described by each equation

What’s the domain of this function? fastttt

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.