def fun_value_and_slope(x, a, b):
    y = a*x + b
    dy = a
    return (y, dy)

p0 = 2.5
p1 = 3.0
x_val = 10.0

(value, slope) = fun_value_and_slope(x_val, p0, p1)
print('Function value = ', value)
print('Slope = ', slope)