Which biconditional is not a good definition?
a. an angle is a right angle if and only if its measure is 90°
b. an angle is acute if and only if its measure is less than 90°
c. two angles are congruent if and only if its measure are the same.
d. an angle is obtuse if and only if its measure is greater than 180°

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b

thus, the first answer choice, y = sec x, is the correct one