If two angles are both vertical and supplementary, then the angles are

we know that

Supplementary angles are those angles whose sum is equal to degrees and vertical angles are angles that are congruent.

so

Let

x--------> the first angle

y--------> the second angle

so

--------> equation

--------> equation

Substitute equation in equation

therefore

the answer is

the angles are right angles

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!