Can someone explain to me how to find angles on graphing and if there is 2x+50 what it : )

Let f(x) = 2x + 50

The angle to this equation would be the coefficient "a''

Look:

f(x) = ax + b

Then,

To this question, a = 2

Always, a = Tg(angle)

That would be the slope of the line.

Tg(angle) = a

Tg(angle) = 2

Apply arctg on both the sides

ArcTg(Tg(angle) ) = Arctg(2)

Arctg(tg ) , They cancel

Angle = Arctg(2)

Calculate the Arctg(2) on the calculator

Angle = 63,43°