Find the angle of intersection between the curves f(x) = 2x + 3 and g(x ) = - 3x + 1

slope of 1st line = 2

so angle it forms with the x-axis is tan^-1(2) = 63.435°
slope of 2nd line = -3
angle it forms with the x-axis is tan^-1(-3) = 108.435°
angle between the lines = 108.438 - 63.426 = 45°